Earlier we looked at how the Stata by command can be used as a prefix for statistical commands (see help by). , " it " stored in a variable of type str80 , still takes up 80 bytes). Variable labels document your data and make it more user-friendly. Create a new variable based on existing data in Stata. : Create a variable (e. -distinct- rules them all Posted on 28 October 2010 by Mitch Abdon In Ways to count the number of unique values in a variable , we have suggested different ways on how to get the number of unique values for a variable. The argument missing_user_values can be passed to write_dta to write user defined missing values only for numeric variables. Stata stores missing values as positive infinity, i. When it does so, it also tells you "( obs ) missing values generated" since the variable var had space for obs values. For a list of topics covered by this series, see the Introduction. 0 for Solaris is accessible on any Athena workstation. d. Among the list of “Stat functions” you will see t() for the distribution function and ttail() for right-tail probabilities. • To see a list of all the variables, variable types, and sample size, type describe. I mean that I want to pick out all the distinct values in a variable and put Stata regards the rows (observations) and columns (variables) of those tables differently. These may be a list of variables in a data set or even a list of data set names. count – report the total number of observations in the dataset. Cox, 2002. 2. This new variable contains the number of unique values of the varlist for each level of the by variable. You can have dates in years, months, or even milliseconds. . You can call it whatever you want, but the variable name goes inside the j() option. Stata’s syntax command greatly simpliﬁes writing your own commands that adhere to the standard Stata syntax. Obs. creates a new variable, var, with all missing values (from index 1 to obs if you have set obs, which in your example you have). "VALLIST: Stata module to list distinct values of a variable," Statistical Software Components S357601, Boston College Department of Economics, revised 15 Apr 2003. Panel data refers to data that follows a cross section over time—for example, a sample of individuals surveyed repeatedly for a number of years or data for all 50 states for all Census years. A list of variables consists of the names of the variables, separated with spaces. With this two-step For example, in the previous example the variable “foreign” is already sorted within our data set. I'd like to see all unique characteristics from the particular variable (type: string), excluding all duplicated one. Going yet further, we may be interested in summary statistics about the data: SUMMARIZE provides statistics such as mean, standard deviation Most solutions here either print only environment variables, or have the drawback that env or (set -o posix; posix) do not print values in parseable form (try to print variable A=$'a\r b'). In Stata you define a label_name (set of value labels) that is used to define a set of labels to be attached to a particular variable. with extreme values that could have a negative effect on our estimators. Transposing a matrix means to interchange rows and columns. Stata for Researchers: Usage and Syntax This is part two of the Stata for Researchers series. find the inner fences. In addition to the output in the shown in the results window, many of Stata’s commands store information about the command and it’s results in memory. You can also use the “list” command on occasion, but be careful with it because it displays the value for every variable and every observation. In this post, I will provide a brief tour of working with dates that will help you get started using all of Stata’s tools. Specifically, Martin is correct to underline that . Unlike packages that read one observation at a time, Stata keeps all data in memory, which is one reason why it is so fast. The advantage of this approach is that you can do this with only built-in Stata commands: clear input X1 X2 X3 1 2 . Store the descriptive statistics of a variable in a macro in Stata. e. When specified, matched observations must not only match on the caliper matching variables, they must also have identical values for every exact matching variable. Sometimes you would like the data shown in columns without the observations wrapping across the screen. However, the code is a complicated macro that is difficult for a beginning SAS programmer to understand. Some Basic Stata Commands Suppose we use the data set of ages and number of sibling that we introduced in the previous section. One logic behind that terminology is that if you remove all the duplicates from Stata datasets are rectangular arrays with n observations on m variables. • To obtain summary statistics of all the variables in the dataset, type summarize. List all Stata data in working directory capture log close close the log on any existing do files logus in "myD F e. (Introduced with Stata 8. new variable Label Data label list list all labels within the dataset label define myLabel 0 "US" 1 "Not US" label values foreign myLabel define a label and apply it the values in foreign Value labels map string descriptions to numbers. we see more examples of Stata treating missing numerical values as large values,. missing. Use Stata value labels to create factors? (version 6. After running the regression type: These plots regress each variable against all others, notice the coefficients on each. . g. It is a matrix where each column and each row has a name. var2 label1 . I would like to list all the unique values of a variable Company_Name containing the word "credit". Compare this to You can abbreviate a variable or variable list this way in any STATA command (where it makes sense), not just in describe. Returned I tried the following, but it does not show me the different values. If you recall Stata tip #31, macros are used as a shorthand to a list of variables (or strings/text). ) values of each cross section in variable x, and enter these into a new variable z. Multiple regression (an extension of simple linear regression) is used to predict the value of a dependent variable (also known as an outcome variable) based on the value of two or more independent variables (also known as predictor variables). Summarize summarize [varlist] [ if expression] [, detail ] Options: varlist - list of variables, separated by spaces (not commas); if you don't indicate a variable list, Stata will summarize all the variables in the data set For instance, to change all code 99s from your variable q57 to missing values, replace does it in the following manner: replace q57=. Stata 1. When using the macro language it is not at all unusual to need to manipulate a list of values. 303–304 Stata tip 86: The missing() function Bill Rising StataCorp College Station, TX brising@stata. 5) if trial2 !=. , y-hat) or the residuals (i. This indicates that all observations are part of both files. This article shows how you can read the values of a variable from a data set into a SAS macro variable. The code needs to extract the last 3 non NA (. I have one specific and one general comment here. As far as it is concerned, any order of observations in which all the values of 0 for foreign precede all the values of 1 is an acceptable solution, and naturally there are many such solutions. Now. When all the characters are digit I get something like 123456789123 for a 12 digit value or 000000000123 for a 3 digit value; however, some of the values are negative and less than 12 digits, e. dta (the master-file), these would get value 1. I need a list of all values that are different in two variables. Stata features a primarily command line interface. In the i() option, you list all identifying variables; these are things like id numbers, or this case state names, that identify individual observations. Variable labels: A string of up to 80 characters used to describe a variable; Value labels labels describing specific values of a variable. How to extract few letters of a string variable in stata? for examining the value in one variable is equal to any value in another variable in STATA? if the values are +/- 3 or above? 7. All constant variables are. In Stata's default setting, a list of all variables in your current data set is displayed in the Variables panel. Patrick Joly, 1998. There is however a problem with this when you have missing values in the variable. This article is part of the Stata for Students series. They allow the underlying data to be numeric (making logical tests simpler) Stata by and egen commands. number of observations number of distinct values list of distinct values 4 levelsof — Levels of variable Acknowledgments The original version of levelsof was written by Nicholas J. 3 . Following are examples of how to create new variables in Stata using the gen (short for generate) and egen commands:. do files PRIVATE loc varLab: variable label foreign store the variable label for foreign in the E. To list all the values of the data simply If the dataset is very big, however, it may not be practical to stare at all the values a variable can take. 3) Removing duplicate Stata Pitfalls. You can simply loop over all variables in your dataset and use the capture and assert commands to test which ones have all their values missing. Second, it assumes a relatively small number of values for case_study_group. stata commands. Introduction to Stata September 23, 2014 Stata is one of a few statistical analysis programs that social scientists use. Basic Panel Data Commands in STATA . The table below (1b) is the same data but the values are now in one column with 12 rows of data. The command would look like: mvdecode variable, mv(0=. • options tells Stata how you want to execute the command. Make sure that all numberic variables have the number of observations in the dataset. If you type the command list all by itself STATA will display values for all This will create a new variable called month that will contain the month value. One common pattern is to cycle through all values of a classifying variable. , English, Reading, Math, Writing) to the numeric expression by double-clicking on the variable names in the left list. Stata has a wide array of tools to work with dates. In other words, it displays the entire dataset. The values must be a list of missing values, valid values are single character strings between a and z. Format” – showing a variable for four states by three years. Create a macro variable whose value is the list of the variables to be dropped. Stata continues to do this until all variables have been used. If you're new to Stata we highly recommend reading the articles in order. Stata®. For example the following Stata code will execute the summarize command for each unique value of marital (married, widowed, etc. But Stata internally stores dates and times as integers and reads them as numeric values. display will try to interpret the variable names and show their values . Afterwards you can the remove all missing values the usual way with drop. Missing values Sort. dta") # Direct export to Stata Create multiple dummy (indicator) variables in Stata For example, the variable region (where 1 indicates Southeast Asia, 2 indicates Eastern Europe, etc. This enables speedy exact matching, by ensuring that all values are stored as precise integers. 1. STATA calls the column version “Long Format. I create a null matrix epsmat and use st_view() to modify epsmat based on the values of the Stata variables eps1 and eps2. With a by it does the same, but also creates a new variable (_Unique by default but can be named in the gen option). To see a full list of computers that have Stata, go to the LIS website, select "Quick Links" and then click "Software on Library & Lab Computers. Data > Describe data > List data. To recode variables in Stata, use the recode command. This may be modiﬁed by the update option, which speciﬁes that non-missing values in the using dataset should replace missing values in the master, Fortunately, Stata has functionality built in that allows you to identify all the files in a folder. As we have seen throughout this manual, you have a choice between using menus and dialogs and using the Command window. The second step is to associate a specific mapping with a particular variable using the . Stata with a list of pitfalls to point out. The following program does everything that the collapse command does, but preserves the variable and value labels. Cox of the Department of Geography at Durham University, UK, and coeditor of the Stata Journal and author of Speaking Stata Graphics. I have data at the country-year-z level, where z is a categorical variable that can take(say) 10 different values (for each country-year). With it, you can specify the number of variables the command should accept; whether it permits an if condition, a number range, and weights; a ﬁle path, if relevant; and a list of possible options. Produces a table with the number of missing values, total number of cases, and percent missing for each variable in varlist. All commands are shown using speci c examples. Convert "_" in Stata variable names to ". Unlike decode, sdecode creates an output string variable containing the values of the input variable as output by the list command and other Stata output, instead of decoding all unlabelled input values to missing. It is also possible to obtain summary statistics for specific variables. In fact, Stata will not tabulate if there are too many different values. Is there a command for this? Thank you! gen newvar2 =(trial2 <1. If no varlist is specified, the values of all the variables are displayed. Things I Love About Stata -- egen mean 30 May 2011 Tags: Stata and Tutorial egen mean. Read values into a SAS macro variable • A Stata dataset is a rectangular arrangement of values, where – rows are observations – columns are variables 4 clear all // describe the current Stata dataset in memory ("master" dataset) describe // create some observations – still no variables set obs 5 // create a variable named x, which has the The list varlist command displays the values of variables If you do not specify from AA 1 each one is clicked, it is added to the list in the window, which is typical of all procedures in Stata that operate on multiple variables. 2 Jan 2006 correlate vone vtwo. Stata’s missing value indicator is a period. If you are new to Stata we strongly recommend reading all the articles in the Stata Basics section. summarize Adding variable names after command provides values of the specific variable. Once the Stata for Researchers: Working With Data This is part four of the Stata for Researchers series. This 6‐variable correlation matrix is small enough to fit in the Stata output window. You can show this list by typing return list. Stata for Students: How Stata Commands Work. If there were observations which occur only in ap. When you load a dataset, you will notice that every variable has a display format. 10 Listing data and basic command syntax Command syntax This chapter gives a basic lesson on Stata’s command syntax while showing how to control the appearance of a data list. Estimation commands in Stata contain many post-estimation commands. 27 Feb 2012 Stata has all the tools required to write very sophisticated programs, but . Any suggestions? Variable labels: describe your variables. encourage good variable names. Whilst Stata does not produce these values as part of the linear regression procedure above, there is a procedure in Stata that you can use to do so. You can even integrate your simulations into Stata’s power commands so that you can easily create custom tables and graphs for a range of parameter values. If you want commas between the variable names, all you have to do is change the 'separated by' value from ' ' to ', '. Missing values. However, some care is needed whenever numeric missing values could appear in a "Label define" syntax for "all other values". Introduction to STATA STATA, like SPSS is a smart data analysis tool used for data management and analysis. We have listed all five of the variables in our dataset in the variable list after the Stata is a general-purpose statistical software package created in 1985 by StataCorp. For this kind of data the first thing to do is to check the variable that contains the time or date range and make sure is the one you need: yearly, Variable list here replace by dots all values of variable gender equal to 9. msdecode is a multivariate If you recorded the missing values for a string variable using some kind of non-blank indicator (for example, 999 or -999) and have already defined that user-missing value in the Variable View window, Automatic Recode will preserve the 'missing' designation, but will still convert the category code to be in the range of the other categories. Setp 2: Assign that label to a variable with those categories using label values: label values . That’s it! After defining all categories, write comma, generate, and give the name of the new variable in parentheses. Stata is available on a number of computers on campus. Is there a way to do this in Stata? Labeling data | Stata Learning Modules This module will show how to create labels for your data. clear all // describe the current stata dataset in memory ("master" dataset) describe // create some observations -- still no variables set obs 5 // create a variable, x, with all the values equal to 1 generate x = 1 // create another variable, y, with the built-in obs number, _n generate y = _n // save the master data into a file on the harddrive Clicking on a variable in the list will bring up the variable label, variable values, and variable value labels for that variable. In the following statistical model, I regress 'Depend1' on three independent variables. Open the Excel file, highlight (select) the observations and variables of interest, copy and paste into the upper left cell of the Stata data editor; the variable names and values will be copied. cx1) that marks the cases with missing values in the original variable (e. Dealing with Extreme Values: Trimming and Bottom- / Top- coding Goal Many inequality measures are sensitive to the values at the bottom and/or top of the income distribution, and some are not defined for non-positive values of income (e. By default, the extremes are the 5 lowest and the 5 highest values. Now that you understand Stata's basic syntax, you're ready to start working with your data. Here is a function that will print all variables, one variable per line, in the POSIX escaped form: Stata commands NOTE: This is a very brief summary of the commands covered in class. Data Integrity Tests for Stata Quick note: in this document I use all caps to denote things that you’d have to fit in for your own applications. Task 3c: How to Generate Means Using Stata. An Introduction to Stata By Mike Anderson Installation and Start Up A 50-user licensed copy of Intercooled Stata 8. txt , r p ac c ra tnw log fi dy uk s Set up search mdesc find the package mdesc to install ssc install mdesc install the package mdesc; needs to be done once packages contain extra commands that expand Stata’s toolkit underlined Note first that the code you quote is illegal. scalars(list) may be used to add other e()-scalars to the table footer (type ereturn list to display a list of available e()-scalars after fitting a model; see help ereturn). Type return list after running piaacdes, piaacreg or piaactab to see returned matrices with results. STATA generates a 16-digit values over the interval [0, 1) for each case in the data. Stata calls these returned results. label define command to create a mapping between numeric values and the words or phrases used to describe those values. variable in its own (year new variable coffee maize Label Data label list list all labels within the dataset label define myLabel 0 "US" 1 "Not US" label values foreign myLabel define a label and apply it the values in foreign Value labels map string descriptions to numbers. For example, scalars(df_m) would report the model degrees of freedom for each model. Stata. If a variable contains numeric values that represent missing values, these have to be changed into one of the codes for missing values (unless they are supposed to be would set the high school dummy variable to one only for observations with both at least 12 years of school and with sex equal to one. If you need help getting data into STATA or doing basic operations, see the earlier STATA handout. Initialize all your variables, taking care to initialize them correctly according to type. will list all the values of the variable race and store them in a macro from the make variable see also Stata has three options for repeating commands over lists or values: download all examples from this cheat sheet in a . Many Stata commands store results in types of lists. For a variable (for example, q1) that contains integers ranging from 1 to 7, to collapse the values into three categories, use: The Stata Journal (2010) 10, Number 2, pp. For more information, visit Create New, or Modify Existing, Variables: Commands generate/replace and egen. which occur only in apequiv. Macro variables are often used to hold this list and there are a couple of storage options. Stata automatically includes a constant in the regression unless you type ",noconstant" after the command. Listing data To see actual data stored in the variables we use the list command (abbreviated as l). x in 1/10 You can get these values at any point after you run a regress command, but remember that once you run a new regression, the predicted values will be based on the most recent regression. However this takes a lot of typing. To see all values (all variables and all observations, not recommended for large data sets): list. The new variable is coded missing except for the first record in each group defined by the levels of the by variable. Stata handout 02 Fall 2016 getting data into Stata. For each var in the variable list, run the two commands we have been running all along. apply the command tabulate foreign All Stata commands h ave e same format (svn tax): log using -myDoFiIe. Once you open Stata, clear will remove all previous variables in the program. Transpose data. Thus, in the example just given, 1, 2, 3, and 4 would be reported by many as the unique values of the variable in question, even though such distinct values could all be repeated in the data—and, in particular, 2, 3, and 4 are indeed repeated. R will return a vector with all the values contained in that variable. Not just that, but it also places the name of each file in a local list which allows you to easily append them and even show their source file in the final dataset. It’ll be obvious from the var labels. Returned Whether you are programming or trying to retrieve values calculated in Stata, your best bet is probably to use the return list command in Stata. , replace Intro Merge – adds variables to a dataset. Stata had an active email list from August 1994 ("Statalist", over 1000 1 Oct 2010 Ways to count the number of unique values in a variable The problem with using -tab- to count the unique number of values is its row limits: 12,000 rows ( Stata/MP and Stata/SE), 3,000 rows in -inspect- and -codebook-, the commands will return the reports for all variables. clear command clears out the dataset that is currently in memory. " As of the writing of this manual, Stata was available in at least some labs in Sunderland, Munroe, the Library, and Bi-Hall. Although many ﬁnd the menus more natural and I see 'unique' or 'distinct' commands will show the total number of unique values in the variable, but they don't actually list each of the unique values. (Here, it shows that I have All data should be stored in numeric format because (1) Stata stores numbers more efficiently than strings and (2) many Stata commands expect values to be stored numerically. There is also a section of 'IF' statements, which set missing-data and out-of-range values of each variable to the SAS missing-data code '. label values . For example, VARIABLE1 is a generic variable name, and CONDITION is a generic condition you might want to include (like age < 100 ). A list of common situations where Stata returns something different from what you may have in mind. There’s a limit of 2,047 variables in Stata/IC, 32,767 in Stata/SE, and 120,000 in Stata/MP. The other parts of this manual are arranged alphabetically. If any other variables are also specified, these are also listed for the same observations. You can STATA COMMANDS USEFUL FOR DATA CLEANING IN • Check that the values of the variable are lower than a minimum and higher than a maximum eret list /* List all Using the collapse command in STATA tends to remove value labels and variable labels. This is as simple as recode v1 (1 = 2). • reshape There are many ways to organize panel data. g, to open a file, to run a regression, to calculate a mean of a variable, etc. is not the only missing value, but the loop in question is easily fixed by foreach x of varlist prean pa_kurn{ replace `x' = 0 if missing(x) } Generally, a minimal -search missing- points to several resources. The closed bracket “}” found on the third line tells Stata to return to the beginning, the “{“ symbol, and perform the same action on the next variable in the list. The macro variable will contain a blank-delimited list of values. The records in a dataset can be sorted according to the values of one or more variables. The longstanding workaround when this is not what you want with regard to missing values is to add the extra condition that z is not Still, by default Stata will not display the data; you have to use the browse or the the edit commands to be described shortly. This function creates a matrix that is a view on the current Stata dataset. The variable names should be separated by commas, and all of the variable names should remain inside the parentheses. [ Date Prev ][ Date Next ][ Thread Prev ][Thread Next][ Date Index ][ Thread Index ] From How can I list observations in blocks? | Stata FAQ Sometimes the output of the list command can be clumsy, showing an entire observation with all of the variables wrapped across the screen. If you leave the list blank, Stata assumes where possible that you mean all variables. a value of 1. describe [varlist] - lists variable names, types and labels Time series data is data collected over time for a single or a group of variables. Thus, to create a new variable and set all the values to missing, you would use the command: gen varname = . To create new variables (typically from other variables in your data set, plus some arithmetic or logical expressions), or to modify variables that already exist in your data set, Stata provides two versions of basically the same procedures: Command generate is used if a new variable is to be added to the data set Most commands in Stata allow (1) a list of variables, (2) an if-statement, and (3) options. Nicholas J. Alternatively, all observations in x should be set to . All examples use supermarket. ) may need to be converted into twelve indicator variables with values of 1 or 0 that describe whether the region is Southeast Asia or not, Eastern Europe or not, etc. I would like to obtain a dataset at the country-year level, with a new (string) variable containing all distinct values of z. Thus, with the auto data, we could cycle through all the values of foreign or rep78. Can I construct a format for this variable that Create new variable out of other variables - STATA? Do any of you know the command for examining the value in one variable is equal to any value in another variable in STATA? values, which Monte Carlo simulations are one way to calculate power and sample-size requirements for complex models, and Stata provides all the tools you need to do this. Generally, you’ll want to leave this alone. • Missing values (. Reading and Using STATA Output. list job weight in 1/10. 18 Mar 2010 März 2010 10:09 To: statalist@hsphsun2. In fact, Stata understands a date and time variable as the difference from the base. This handout is designed to explain the STATA readout you get when doing regression. mdesc works with both numeric and character variables. A variable name may contain only the digits 0 to 9 and upper or lower case English alphabets (A to Z); and the first character cannot be a number. are set in italics while built-in Stata functions and operators are Predicted Scores and Residuals in Stata 01 Oct 2013 Tags: Stata and Tutorial Predicted Scores in Stata. For example, to get the N, mean, and standard deviation of personal income, enter: users sometimes forget that in Stata numeric missing is regarded as arbitrarily large. filling missing values in time series using stata for a variable expected to vary minimally from the fitted values, which might be known from external information. list trial2 newvar1 newvar2. You can look at your data in a scatter plot: In the CCHS dataset, caseid is the individual id, while hwtghtm is the height in meters. Each of those variables will eventually be a string. 000 (the first millisecond of 01jan1960); therefore “25jan2016 08:30:25” for us human 1/9/03 C:\all\help\helpnew\string_stata. If you tell Stata that the list you want to loop over is an official Stata varlist you can use standard varlist shortcuts, like x* for all variables that begin with x and x-z for all the variables from x to z. The variable type (as it is set in the original file) will also be selected in the Target Type section; you may change this by ticking one of the other radio buttons. According to description mdesc:. Some useful commands . What command to use in Stata to check if value in one variable is equal to any value in another variable? Hi, Do any of you know the command for examining the value in one variable is equal to any This video shows you how to change variable values in Stata. count if var > 10 - count how many observations meet certain criteria summarize – show the mean, median, max, min of one or more variables. 0 in June 1988, and they could hold any even number of characters from 2 (str2 type) **Generate lag values of a variable x (by creating a new variable) generate x1lag1=x1[_n-1] (this command uses square brackets and there is an underscore before the ‘n-1’) **Lag values of a variable x (without creating a new variable; examine first 10 values) list x L. ) are represented internally as very large Introduction to Stata If in your dataset the number zero indicates the same thing as a missing value (in some records) you can use mvdecode to replace them with a dot (= how Stata usually represents missing values). Not all data providers choose to code missing values as Stata default! Some will code missing values as very large numbers. This argument be a dictionary with keys as variable names matching variable names in the dataframe. by and bysort. Merging two datasets require that both have at least one variable in common (either string or numeric). org/stata-videos What command can I use to select variables containing specific pattern in STATA? but for looking at the variable values. if q57==99 recode is a very powerful command to use for data manipulation (see Stata tips #3 and #16 for more detailed information). When the same variable is present in each of the ﬁles, Stata’s default behavior is to hold the master data inviolate and discard the using dataset’s copy of that variable. String variables were introduced in Stata 2. 7. To use it, simply type “add stata” (hit enter) and then “xstata” (hit enter). In this example we'll merge categories 1 and 2 of a variable v1. tab my_var – show a breakdown of values for one variable. , e-hat) Example: regress . Stata tip: collapse dataset while preserving variable and value labels When I use the collapse command, I loose the variable and value labels associated with my variables. Also, even with a typo fix it does not cover string missings. Finally, I assign this matrix to hold the draws stored in u, effectively populating the Stata variables eps1 and eps2 with the random draws. Recode an existing variable in Stata. txt. All data points seem to be in range, no outliers observed. Either each word of the list can be stored in its own indexed macro variable The other day I encountered a SAS Knowledge Base article that shows how to count the number of missing and nonmissing values for each variable in a data set. Most of The dataset is always rectangular in format, that is, all variables hold the same have the same length, although some entries may be missing values). – user40980 May 1 '15 at 2:15 1 Then, there is BitSet which is not part of the Collections framework but provides a way of keeping positive int s and telling whether one is contained or not. For more details and tests on this and influential and leverage variables please check list(varlist [if exp] [in range] [, list_options] ) specifies a list of variables in the output dataset, which will be listed to the Stata log by descsave. The "\ all" command tells Stata to do this to all variables; Use this command carefully! If you have any variables where "999" is a legitimate value, Stata is going to recode it to missing; As an alternative, you could list var names separately rather than using "\ all " mpg, Stata forgets the particular order of observations that it obtained previously. Stata chose to list all 12 variables in display format, but when the varlist foreach offers a way of repeating one or more Stata commands; see also [P] foreach. This article will introduce Stata's user interface and teach you its basic syntax. The basic syntax of any Stata command: COMMAND Variable-list Restrictions, options a) Basic Commands Stata handles two different types of variables: numeric variables (whose values are only real numbers), and string variables whose values are combinations of alphabetic and/or numeric variables. underscore. # convert. Hit the space bar to see In Stata, if your variable is numeric and you are missing data, you will see . If you do this, then you can re-sort the data after the stem-and-leaf plot according to the index variable (Stata command: sort index ) so that the data is back in the original order. A 'PROC DATASETS' command is added after the data definitions; this will generate a list of variables created by SAS. When generating a new variable Method 1 (1) Using Nick Cox's -labgen-. (Naturally, obs. It goes immediately after the command. edu Subject: st: display distinct values of variables Dear Statalist, Is there a way to produce a A varlist is a list of variable names. As you can see in the Stata output below, the new variable newvar2 has missing values for observations that are also missing for trial2. An example of when one might need to do this is if they needed to append Counting observations between 2 values in stata? Hi all. A larger matrix change the values and value labels then store in a new variable, foreign2 CHANGE ROW VALUES mvencode _all, mv(9999) useful for exporting data replace missing values with the number 9999 for all variables mvdecode _all, mv(9999) replace the number 9999 with missing value in all variables useful for cleaning survey datasets REPLACE MISSING VALUES Hi, Following on this, I have a quick question: What if all values of a variable are 12 characters. ❑ A variable can have one or several values (information for If you type labelbook it will list all the labels in the datafile. Feel free to share your own stories using the "Edit" button at the top right corner (don't forget to add your name in the list of contributors). josephncohen. IMPORTANT – Despite your saving dates in excel as bona fide dates, Stata will input these as string. Optionally values may be identified as extremes according to their distance from the nearer quartile. var1 label1 . Below I have included code to save and restore the value labels (assuming you keep all the variables except the 'over' variable that you specify in the collapse command). More commands are described in the respective handouts. generate randnum = uniform(). The reshape command can be I sum: numerical summary of all variables (add a list of variable names to only summarize a subset) I More detailed summary by adding the suboption , detail I tab varname: tabulates all possible values of one variable (varname = the name of that particular variable) I tab varname, nolabel suppresses any value labels 21/86 I have the feeling that creating a matrix to export variable values to latex is a somewhat roundabout way. You can browse this panel and look at variable names and labels. I need a variable that is named for each one of the permutations of that list, including single letters, two letters, three letters12 letters. (The * is a “wildcard”. It would also be nice if there was a way to check if 10th value is tied with 11th, 12th, etc. Stata tries very hard to make all its commands work the same way. y is the dependent variable, all others are independent variables. Stata is in the mid-range of how easy it is to use. • To browse the raw data in spreadsheet form, type browse. Python is a general purpose programming language where a "variable" is not a column of data. Most statistical programs (including SAS, SPSS, and Stata) will automatically . Stata will list all the variables in your data set and give tyeir properties (such as whether they are alphanumeric). Is it possible for stata to show a frequency table of only the top n categories in a variable without using collapse? collapse is fine but it does clear the existing data in your memory. I begin with an example. It is a fast and easy to use, across all operating systems such as Windows, Unix and Mac. Other options include SPSS, considered easier to use, but clunky if performing many commands, SAS, and R. This allows the user, as well as other Stata commands, to easily make use of this information. Warn if a variable is specified with value labels and those value labels are not present in the file. predict yhat, xb *generates a new var, yhat, equal to x*beta-hat The above loop repeats command tab for each variable mentioned after in in the first line of command. A Stata variable name can contain up to 32 characters in any version of Stata (Small, Stata/IC, Stata/SE, or Stata/MP). Exact matching variables must have a data type of byte, int or long. Displays the labels for each variable. (Stata tells you there are 3 rows and 1 column in this particular vector) You can also form a matrix using the variable names in your data set Suppose you have data set containing the variable names “gdp” and “income” Then mkmat gdp income, mat(X) will create a matrix X with all the values for gdp from the data set in the 1st In statistics, a categorical variable is a variable that can take on one of a limited, and usually fixed number of possible values, assigning each individual or other unit of observation to a particular group or nominal category on the basis of some qualitative property. If the dataset is opened correctly, a list of the variable names should appear in the variables window. STATA. var is just a name to hold a single variable name as we loop over them one at a time. things: a list of all old variable category values with only spaces between the values, an equals sign, the new category value, and the new category label in double quotes. As we discussed in class, the predicted value of the outcome variable can be created using the regression model. For many of Stata's commands (particularly statistical ones), statistics generated or other data are saved in scalars, matrices, or macros. x1). g, File-> open-> documents-> school-> Stata Homework -> dataset. `varlist’ expands to the list of variables specified to our do-file. That assumes a few things. stored in the string (e. Variables can be anything, a single number, a matrix, a list, a string, etc. de Describes all the variables. Many Stata commands can be executed on a group-by-group basis. For example, we can use the auto dataset from Stata to look at the relationship between miles per gallon and weight across Using Stata for Confidence Intervals All of the confidence interval problems we have discussed so far can be solved in Stata via either (a) statistical calculator functions, where you provide Stata with the necessary summary statistics for means, standard deviations, and sample sizes; these commands end with an i, where the i Stata Cheat Sheets (all) duplicates report finds all duplicate values in each variable describe make price display variable type, format, and any value/variable Stata will report, for each variable, the number of observations, mean, standard error, minimum and maximum values. In this example, you will use Stata to generate tables of means and standard errors for average cholesterol levels of persons 20 years and older by sex and race-ethnicity. You'll still have to add the values to the set somehow, but you can test against all of them in one go with the set. Random numbers in STATA . 0 or later). We'll do this by changing all values of 1 into 2. I work a lot with clustered data, including group psychotherapy data (people clustered in groups), individual psychotherapy data (people clustered within therapists), and longitudinal data (observations clustered within people). 3. Now add each of the variables (i. In this case what you are looking for is what gets stored in r(r) after you use tabulate. If you are new to Stata’s data management features, we recommend that you read the following ﬁrst: Is there a way to tell Stata to try all values of a particular variable in a foreach different sets of values, or you know the values but wish to avoid typing a long list. Stata will sort the data in ascending order by default. duplicates tag, generate(var) creates a new variable var that gives the number of duplicates of each variable. Not all characters in the keyboard, however, are allowed in naming variables. We need to do this before we can create or read a new dataset. 1 Gotcha 10: Invalid initial values become missing val-ues Stata has ve di erent types of numeric variable: byte, intand longfor inte- summation of values within one column in a panel dataset I have a panel dataset and I wonder if it is possible to generate in Stata a new variable that is the sum of observations for a variable for two of my panels only (ie it is a summation of values within one column). To list the last 10 values for two variables: list vone vtwo (This computes the ordinary least squares estimates. ) predict yhat (Creates a variable yhat that contains the predicted values of y based on the regression just run. You don’t have to surround the variable name by quotation marks (as you would when you use the indices). [ period] in The command summarize will list how many missing values you have. The appropriate Stata command is xpose So you specify the data frame, followed by a dollar sign and then the name of the variable. Data in wide-format: counting values in varlists //shows names of coefficients . Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist. Originally, variables could only be numeric, although value labels were possible. labels. Macro and Loop in Stata SOC 561 values in race variable 28 Example List can contain variables, string, and numeric. Use the macro variable in a DROP statement in a subsequent DATA step. To create a new variable (for example, newvar) and set its value to 0, use: Missing values are excluded from all statistical analyses by default; some procedures (like frequency tables or crosstabulations) permit inclusion of missing values via options. 5 . All values that are not 1 are left unaltered. In the following codes, we tell Stata to do the same thing (the computation: c*9/5+32) for each of the variable in the varlist – mtemp1 to mtemp12. The diet dataset is currently not sorted but we might have it sorted by any variable or combinations of several variables. LIST IN 1/10 displays the –rst 10 observations of all the variables in the data set. Frequently used Stata commands. , 00000-123584. This will list all Stata commands and functions related to the t distribution. Is it possible to use listtex to list values of the same variable but for different years in separate columns? > > I will be vary grateful for all help. Creating a do-file Do-file is an interface in Stata which allows the researcher to compile all the commands and results at one place. I am currently working with a rather large dataset that takes a fairly long time to load into memory even when I am running this on a high performance system. list cyp CYPTotal if cyp != Those letters are not values in a current variable, though if that's required I can certainly create a variable with those letters as values. Stata allows you to label your data file ( data label ), to label the variables within your data file ( variable labels ), and to label the values for your variables ( value labels ). " in R names? # warn. label values command. The Review window shows a list of all the commands you have already run. sdecode is especially useful if a numeric variable has value labels for some values but not for others. y x1 x2 x3 . I'd add mdesc command to proposed solutions. A more general solution is to define numerically what an outlier is and then specify the appropriate selection, i. Data label: A descriptive label describing a dataset However, in your answer, all correlations will become close to -1, as they are based on deviation of 0 and 1000-something from the mean of your constructed variable padded with zeroes; and a 1000-something value of one of the group-wise variables is always associated with a zero value on all other variables. I have "concomintant disease" as a text variable and want to use for Instructional video on how to rename and label variables and variable values using Stata, data analysis and statistical software. each variable in its own column. _____ Do you Yahoo!? Check out the new Yahoo! Front Page. duplicates list lists all duplicated observations. This will ensure that the only variables in Stata are related to the homework assignment. extremes lists extreme values of a numeric variable. STATA can reshape the whole data at one time. episode identifier variable created by. ) with EMPIDS to the In Stata's default setting, a list of all variables in your current data set is displayed in the Variables panel. de varname Describes varname, rather than all the variables de var* Describes all variables that start with the letters var. The first step is to use the . Visit my website While generic lists can contain variable names, you have to type out all the names individually. 2. Adding a value label to a variable in Stata is a two-step process. I'd like to loop > across my > variables regressing on another variable so I can predict values > for each > variable under an assumption about my independent variable. 2016-03-06 15 29 Example Loops execute LIST VAR1 VAR2 displays the variables named VAR1, VAR2. Missing observations for numeric variables are sorted last. Statalist: the Stata forum. It depends on what type of command you use, just for future reference there is also ereturn list and sreturn list. docx Page 11of 13 Step 2 – Stata ___a. During the data cleaning process, make sure to clean categorical string variables and convert them into numeric codes. describe - list the variables, total observations, and variable types & labels. I have a variable in stata which has the following structure: I would not like to loop or list all variables but one. To use recode, you must provide a list of variables to be recoded and the rules associated with that change. Stata can also compute tail probabilities for the normal, chi-squared and F distributions, among others. The display of the latter will be rather short, unless you widen the panel at the cost of the Results window. This video follows a step by step process of creating variable labels, value labels, and creating a new variable with values labels automatically added with the recode command. a very large positive value, i. Stata will code these values as zeros because it’s default behavior is to evaluate the sum of missing values as 0. If not, then the variable names in the c() option of table will need adjusted. 1 Apr 2004 -levels- was introduced to Stata 8 after its release, so make sure you have a fully up-to-date Stata, by typeing "update query" in Stata and Observations are distinct on a variable list if they differ with respect to that distinct values of rep78 and foreign combined, that is, every possible pair except the Hello, I have several variables, each of which have duplicate values. 6list— List values of variables The ﬁrst case is an example of display format; the second is an example of table format. Why it is useful: _n and _N are Stata system variables that can be used to generate a unique code for each observation (_n) or to identify the total number of observations (_N). except the last 3 (with allowed gaps). sort job espant Stata's toolkit variable name, or variable label observations create compact table of summary statistics aspiays stats CIS, has(ty pe stri search mdesc lookfor show histogram of data, for each value of rep78. Note again that the row names are dropped here. Furthermore, you can use your linear regression equation to make predictions about the value of the dependent variable based on different values of the independent variable. STATA uses a pseudo-random number function uniform() to generate random numbers. I. wpd String Variables in Stata - Numeric to String, and Concatenating1 The following document provides an example of how to create string variables from numeric variables, and then concatenate string variables into one. Use arrays and iterative DO loops to determine whether a variable's values are missing for all observations. The recode command combines 4 or the 5 steps Ways to count the number of unique values in a variable Posted on 1 October 2010 by Mitch Abdon There are at least 3 convenient ways to count the number of distinct values contained in a variable: -tab-, -inspect-, and -codebook-. If you type in: . dta. ' (a period). Information about variables. Try the following commands and make sure you understand the sorting procedure in Stata. Hence, z>=42will be true for all the missing values of z, as well as for all values that are greater than or equal to 42. org. All of this can be done 1 List all variables using the command describe 2 Understand more about the storage type by using the command coodebook 3 Use the data editor/browser to actually see the data 4 Check for missing values 5 Sometimes it helps to change the order: order foregin (now variable foreign is the rst variable in the dataset) Following this entry,[D] data management provides an overview of data management in Stata and of Stata’s data management commands. Commands: Here are some other commands that you may find useful (this is by no means an exhaustive list of all Stata commands): Stata will now create the graph for the first variable in my list and save it. If another variable has the same corresponding categories you can use the same label, type . Menu. by opening Stata and using File Open to locate and open the dataset; or by double clicking the file in My Computer. You absolutely must have a look at the online help for the command you need to figure out (whelp command), and you should consult the manual for a more extensive understanding of how a given command works, as only very basic usage is given here. In Stata, the . will place variable gender at the current column of income and will move all variables, including income, one column to the right. The base (the numeric value 0) of a datetime variable begins at 01jan1960 00:00:00. In this article you'll learn how to create new variables and change existing variables. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together create a sorted list of distinct values of rep78, store results in a local macro called levels summarize `myLocal' summarize contents of local myLocal add a ` before and a ' after local macro name to call LOCALS available only in programs, loops, or . If we wanted to examine the price by mpg, we would need to sort miles per gallon. In reality, the first line of command creates a local macro called x, which includes variables q27a, q27b, q27c, q27d and q27e. 0 was released in January 1985. NB: Some of these methods assume that the values don't have spaces or symbols that Stata wouldn't accept in the variable names - otherwise, assign only the variable labels and then see below how to convert labels into names. First, it assumes there are values 2-5 on religion. do file return list ereturn list e r. For example, person's age is sometimes coded 999 for missing. ) through a do-file (which we will discuss later). Type help merge for details. gen newvar2 =(trial2 <1. It does not matter if a new variable z is created, or the observations in x is replaced so that it looks like z. Are your data contained in an Excel Spread sheet? You could; a. x L2. harvard. For example, from the second table we see that two cases have missing values on variable 1 (landval), but complete data on all other variables, and that one case is missing data on variables 2, 4, and 5. egen rowmean, on the other hand, will disregard the missing values and compute the mean of only the nonmissing values in the variable list. LIST displays all the variables in STATA™s current memory. A command tells Stata what to do – e. For more Stata videos, see www. Examples of the label variable command are shown below in a do-file. The user may optionally also specify if or in clauses to list subsets of variables, or change the display style using a list of list_options allowed as options by the list command. The Pandas package implements a kind of variable called a DataFrame that acts a lot like the single dataset in Stata. Dropping all missing values means dropping all observations with any missing values on any variable. They allow the underlying data to be numeric (making logical tests generate urbdum= (urb>50) produces the variable as when urb>50 is true Stata produces a value or 1 (for true) and 0 otherwise (=false). You can then use the "macro list" to specify the parameters to a SAS procedure. • To obtain frequency counts of the values of the variable happy, type tab happy. To see all values (all variables and all observations, not recommended for large data sets): list Hit the space bar to see the next page after "-more-" or type "q" to "break" (stop/interrupt the listing). codebook displays information about variables' names, labels and values. Read more… How do you get top 10 values in a variable? As the title says, my Google-fu has failed me to find the right code on how to do this. Alternatively, we can use the -foreach- command to achieve the same goal. describe displays a summary of a Stata dataset, describing the variables and other information. The table format is more readable and takes less space, but it is effective only if the variables can ﬁt on one line across the screen. duplicates drop keeps only the first of the duplicates and drops the rest. Stata commands are set in Courier; example speci c datafiles, variables, etc. ). If this is the case, Stata has no way of knowing that 999 is meant to be a missing value and will include 999 when you ask for, say, average age. The bottom row shows that four cases are not missing any values at all (all underscores). As a small matter of history, Stata’s variable types were not all available from the beginning. A. 8. , any measure that calculates a logarithm). For example: predict fitted This creates a macro variable called &vlist that will contain the names of all the variables in your dataset, separated by a space. One way of doing this is to used the lv command: It displays among other information the inner fences, and then use this in a logical expression: A Short Guide to Stata 14 2 1 Introduction This guide introduces the basic commands of Stata. com Stata’s treatment of missing numeric values in expressions is clear: numeric values behave like inﬁnity. Logistics A) If you are using your own computer then this first step may be redundant. Verify by running frequencies for var1 and var2 (using tab) If you type labelbook it will list all the labels in For instance, to change all code 99s from your variable q57 to missing values, replace does it in the following manner: replace q57=. Stata for Students: Creating Variables and Labels. Some Stata Tips for Working with Another Data Set. 2 The gotchas Here is a countdown of my top 10 gotchas, listed in order of increasing likelihood of causing problems. To create predicted values you just type predict and the name of a new variable Stata will give you the fitted values. dta(mydata, file = "test. Each combination of country-year-z is unique in the dataset. One way to sort data is using a simple sort command followed by the variable name. In other words, make sure that the minimum, maximum, and mean values are feasible for each variable in your dataset. Description list displays the values of variables. Data to Stata write. They can • variables (each variable name separated by a space) are the list of variables used to perform the command. These values are represented internally as very large numbers, so valid_numbers are always smaller than these. It's up to you to decide which one is better. sav. Merge Categories of One Variable. The screenshot illustrates the effect. In next section short notes for quick use of Stata® for beginner users are provided. Dear list members, Suppose that variable rr_job takes the values 1,2,3,,999. That is, the values of any given row in the original data will end up in a column, and vice versa. dta (the using-file), would have _merge==2. ): Multiple Regression Analysis using Stata Introduction. Then full syntax three commands are presented (equivalent with Stata® help files for those commands) followed by extended STATA added a variable _merge which equals 3 for all observations. tabstat command computes aggregate statistics of variables such as mean and standard deviation, and its save option stores these statistics in a matrix. "CHARLIST: Stata module to list characters present in string variable," Statistical Software Components S430301, Boston College Department of Economics, revised 04 Mar 2014. Most relevant are commands for predicting fitted values of the dependent variable (i. x L3. To list the first 10 values for two variables: list vone vtwo in 1/10 9. After you do your tab like you showed, a set of variables get saved. More generally, be careful what you ask for. Missing values for string variables are denoted by "" (empty string); not to be confused with a string with all blanks, such as " ". We could have used variable, or just v, or even z, it would not matter. Only if there are missing values in all of the variables specified, egen rowmean will put missing value in the generated variable (just like the gen command). Look at these numbers and make sure they make sense. ” Note that another column has been added to show the year. stata list all values of a variable

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