Stata and command. The files that comprise a new feature are called a package, and a package usually consists of one or more ado-files and help files. Nov 16, 2022 · Stata has a long history of meta-analysis methods contributed by Stata researchers, for instance, Palmer and Sterne (2016). bsample draws a sample with replacement from a dataset. The identity of the Mar 10, 2024 · Stata will give us the following graph: The graph indicates that the treatment and the control group had parallel satisfaction level prior to the policy change. Newer versions of Stata can always read datasets created by older versions of Stata. Now there was a logic behind the use of summarize ’s formula for aweight s: s 2 = {n/[W(n - 1)]} sum w i (x i - xbar) 2. The summative score is divided by the number of items over which the sum is calculated. apply the function: what are column to save output as condition: only Useful shortcuts. 2004. Let's quickly look at one possible workflow. Stata Technical Bulletin 3: 19. 10, pp. First, get the dataset by typing: sysuse nlsw88, clear. But in Stata, we usually write: if fyear >= 2001 & fyear <= 2010. aweights, fweights, and iweights are allowed. 8estimates table— Compare estimation results. We will explore descriptive statistics of dataset nlsw88 provided by Stata with the package. ample is a reference to chapter 27, Overview of Stata estimation commands, in the User’s Guide; the second is a reference to the regress entry in the Base Reference Manual; and the third is a reference to the reshape entry in the Data Management Reference Manual. Technical note: Mixed data types Because Excel’s data type is cell based, import excel may encounter a column of cells with mixed data types. cond() works like this: Basic Stata Commands ECON113 Professor Spearot TA Jae Hoon Choi 1 Basic Statistics • summarize: givesussummarystatistics – Afteropeningthedatafile Common Graph Options. sg3. } and . This module shows the use of if with common Stata commands. Also see [D] compress — Compress data in memory [D] corr2data — Create dataset with specified correlation structure i’s plus one for y) is sufficiently small—meaning that it can fit in a Stata matrix (see[R] Limits). with Stata Cheat Sheet All Stata commands have the same format (syntax): For more info, see Stata’s reference manual (stata. Speaking Stata: Loops in parallel. Does anyone have a clue how to fix this issue? Looking forward to receiving any suggestions. The new commands are. College Station, TX: Stata Press. dta. 1/0 variables are generally more useful. For this module, we will focus on the variables make, rep78, foreign, mpg, and price. And, Quick starts help new users get started table— Table of frequencies, summaries, and command results 7 command is any command that follows standard Stata syntax. sort state year. We can use the keep command to keep just these five variables. 44–46. More importantly, forecast create creates the internal data structures Stata uses to keep track of your model. Stata commands are shown in red. ado, net, update adoupdate. You wish to create a new variable named dup Unlike most Stata commands, generate() does not use casewise deletion. areg provides a way of obtaining estimates of —but not the i’s—in these cases. Time variable: year, 68 to 88, but with See[R] table for a more flexible command that produces one-, two-, and n-way tables of frequencies and a wide variety of summary statistics. 2013. the open brace must appear on the same line as nosvyadjust is for use with svy estimation commands; see[SVY] svy estimation. Stata Journal 20: 999–1015. com if — if programming command SyntaxDescriptionRemarks and examplesReferenceAlso see Syntax if exp { or if exp single command multiple commands} which, in either case, may be followed by else { or else single command multiple commands} If you put braces following the if or else, 1. Stata Journal 13: 217–219. Also see [P] continue — Break out of loops [P] forvalues — Loop over consecutive values [P] if — if See the Stata capabilities page for information about the capabilities of Stata, including Linear models, Binary, count, and limited dependent variables, Resampling and simulation methods, Graphics, Survey methods, Survival analysis; Advanced Statistics – Survey commands and clustering. docx". arguments may be anything so long as they do not include an if clause, in range, or weight specification. (2) this relationship is additive (i. Use input to type in your own dataset fragment that others can experiment with. The full syntax of the commands is by varlist 1 (varlist 2), sort rc0: stata cmd bysort varlist 1 (varlist 2), rc0: stata cmd Description Most Stata commands allow the byprefix, which repeats the command for each group of observations Let’s get start with the csdid package in Stata We first need to install csdid and its sister package, drdid, that implements Sant’Anna and Zhao (2020); seeRios-Avila, Naqvi and Sant’Anna (2021) * Let's first install drdid ssc install drdid, all replace * Now let's install csdid ssc install csdid, all replace 9. If you do not find the command, look in thesubject indexin[I] Stata Glossary and Index. See [GSU] 2 The Stata user interface for more information. You can transition seamlessly across entries using the links within each entry. Erratum: Speaking Stata: Loops, again and again. pwd, cd. A score is created for every observation for which there is a response to at least one item (one variable in varlist is not missing). didregress can be used with repeated cross-sectional data, where we sample different units of observations at different points in time. , for customized predictions. e. š"HÛlÑ Û \iVKX$eRòÚùõ=3CŠ jtÙÍ6 Ã+Š ž9—ï Most Stata commands allow the byprefix, which repeats the command for each group of observations for which the values of the variables in varlist are the same. Let’s first use the auto data file. Example 1 We have data on the price, weight, mileage rating, and repair record of 22 foreign and 52 domestic 1978 automobiles. It is assumed the reader is using version 11, although this is generally not necessary to follow the a command. Using and saving data from disk. Nov 11, 2016 · #1. Many commands can be abbreviated: sum instead of summarize, tab instead of tabulate, reg instead of regress. The describe command tells you information about the data that is currently than using menus and dialogs. Products. Topics covered fall under the following areas: data management, graphing, regression analysis, binary regression, ordered and multinomial regression, time series and panel data. medeff (regress m x c) (logit y m x mx c), mediate(m) treat(x) [interact(mx) sims(#) seed(#) vce() level()] Jun 24, 2016 · Most Stata commands are verbs. Use list to list data when you are doing so. Stata Technical Bulletin 60: 7–8. As you learn more commands in Stata, you can save yourself time by typing these commands directly into the Command window. Inputting data into Stata. HTML. Quick start Tabulation of v1, reporting means and standard deviations of x and frequencies If your colleague is using Stata 11, 12, or 13, you can save the dataset in Stata 11, 12, or 13 format by using the saveold command; see[D] save. You can use postestimation command predictnl to obtain point estimates, standard errors, etc. com This command is probably most easily understood by going through a series of examples. Whereas generate is used to create new variables, replace is the command used for existing variables. frame framename: one_stata_command. There is one record per kid. Nov 16, 2022 · Stata has a simple, consistent command syntax. In Stata, this condition becomes y[_n] > record[_n - 1] But y[_n] can just be written y, as Stata by default always works on the current observation number (or, more precisely, all of them in sequence). You can create a scatterplot with more than two variables by simply typing more variables after the scatter command. sysuse auto Version info: Code for this page was tested in Stata 12. Creating and Recoding Variables. Speaking Stata: Loops, again and again. For a general discussion of linear regression, seeKutner et al. do”. The order of Boolean operations in Stata, as in most programming languages, is that & takes precedence over |. Along the top menu bar, go to Data > Data Editor > Data Editor (Browse). Nov 16, 2022 · What is true and false in Stata? Most computer languages have some way of indicating and working with what is true and what is false, but not all languages choose exactly the same way. Reading Data in Stata. Case 1: Identifying duplicates based on a subset of variables. They tell Stata to do something: summarize, tabulate, regress, etc. Type use “c:\mydata\mydatafile. B. Stata offers a suite of commands, meta , to perform meta-analysis. keep make rep78 foreign mpg price Nov 16, 2022 · Stata cheat sheets. and become the default setting when you invoke Stata. Stata is ready to help you create both standard and customized tables, whether you want a table for the web that looks like. putdocx table results = etable . You can find all of these documented in the Stata Functions Reference Manual. Stata Journal 21: 555. For the case mui = mu, the variance of xbar = (sum wi xi)/ (sum wi) is sigma2/W. Note: This code was tested in Stata 12. Stata Technical Bulletin 2: 16–17. by state: gen lag1 = x[_n-1] if year==year[_n-1]+1. Regards. 10 Prefix commands. The suite is broad, yet one of its strengths is its simplicity. The regress command (see[R] regress) will display the coefficients, standard errors, etc. These commands provide a unified May 13, 2019 · Empower “and” and “or” in IF statement in Stata. A series of variables appears Title stata. xtdidregress is for use with panel (longitudinal) data. These compact yet well-organized sheets cover everything you need, from syntax and data processing to plotting and programming, making them handy references to download for May 27, 2020 · Stata Commands. Need a little help with some Stata basics? Look no further than these excellent cheat sheets by data practitioners Dr. SeeStock and Watson(2019) andWooldridge(2020) for an excellent treatment of estimation, inference, interpretation, and specification testing in linear getting started with Stata. The syntax for the list command can be seen by typing help list Nov 16, 2022 · System for collecting results from multiple commands and producing tables of results. The replace command cannot be abbreviated. 11 Nov 2016, 13:56. Stata’s documentation consists of over 18,000 pages detailing each feature in Stata including the methods and formulas and fully worked examples. The History window keeps track of all commands Stata has run, successful and unsuccessful. dta file. marginscontplot: Plotting the marginal effects of continuous predictors. Note: for your data, open it from your working directory by clicking File → Open → your . Normally the command itself comes first and then you tell Stata the details of what you want it to do after. Describe your dataset. Built-in programs or functions that are not accompanied by a help file, like _regress, can,of course, no be detected by this mechanism. Menu Statistics > Summaries, tables, and tests > Summary and descriptive statistics > Summary statistics Description We will illustrate this using an example showing how you can collapse data across kids to make family level data. Stata uses two different commands to prevent you from accidentally modifying your data. putdocx begin . if generator=="solar" & (rate<0 | rate>200) I know I could do this in two separate lines, but that seems inefficient, especially because I have many lines of similar code. The commands can then easily be rerun. 3Programming considerations 9. 1991a. Tim Essam and Dr. Inputting raw data files into Stata. 2021b. Also see[R] tabstat for yet another alternative. It specifies that the Wald test be carried out without the default adjustment for the design degrees of freedom. Subsetting variables and observations. This FAQ is likely only of interest to users of previous versions of Stata. dta is assumed. Nov 16, 2022 · Stata’s programmability makes performing bootstrap sampling and estimation possible (see Efron 1979, 1982; Efron and Tibshirani 1993; Mooney and Duval 1993 ). 2Side effects of clicking on Break 9. In such a case, the following rules are used to determine the variable type in Stata of the imported column. We will cover enough to get you started; help language has more information and examples, and [U] 11 Language syntax has all the details. Commands have a consistent and predictable syntax, whether the command fits a model, produces descriptive statistics, or performs a data management task. Nov 16, 2022 · Logic of summarize’s formula. And much more. dta, run Stata and you can either: Go to file->open in the menu, or. 2016. 2001. We will demonstrate this using summarize as an example, although this general structure applies to most Stata commands. Thanks a lot. This will show us the actual data for all 58 patients: Step 3: Visualize the data. However, Stata completely crashes when I click on the install button. Nov 16, 2022 · Starting with Stata 8, the duplicates command provides a way to report on, give examples of, list, browse, tag, or drop duplicate observations. Not all the entries in the Base Reference Manual are Stata commands; some contain technical Stata provides mathematical functions, probability and density functions, matrix functions, string functions, functions for dealing with dates and time series, and a set of special functions for programmers. Step 2: View the raw data. We can also test the parallel trend assumption using the following command: estat ptrends. dta) To open files already in Stata with extension *. References Baldwin, S. Nov 16, 2022 · Use Stata's power commands or interactive Control Panel to compute power and sample size, create customized tables, and automatically graph the relationships between power, sample size, and effect size for your planned study. Oct 6, 2016 · If you need to look to see how the reshape command works, type help reshape at the Stata prompt. Many commands can be abbreviated: sum instead of summarize, tab instead of tabulate Stata's didregress and xtdidregress commands fit DID and DDD models that control for unobserved group and time effects. This can be avoided by using so- called “do-files” where Stata commands are saved as a script in a simple text file with the ending “. 1 Making Stata stop what it is doing When you want to make Stata stop what it is doing and return to the Stata dot prompt, you click on Break: Stata for Windows: click on the Break button (it is the button with the big red X), or press than using menus and dialogs. Use the advanced editing options to appropriately format quotes, data, code and Stata output. docx, we would type the following putdocx commands: . The syntax for the list command can be seen by typing help list Nov 16, 2022 · You can create lag (or lead) variables for different subgroups using the by prefix. 1: Tests for departure from normality. Stata can also produce command log files—files that contain only what you type. Stata follows two rules, the second of which may be considered as a generalization of the first. A do-file is a standard text file that is executed by Stata when you type do filename. The name you give the model mainly controls how output from forecast commands is labeled. or that same table for your LaTeX paper. Before we perform a one-way ANOVA, let’s first view the raw data. 2021a. dta from disk and places it in memory so we can analyze and/or modify it. The net command (see[R] net) Title stata. Psychological Statistics and Psychometrics Using Stata. list make Cox, N. Stata Journal 13: 510–527. 6 weight. 2: Shapiro–Wilk and Shapiro–Francia tests. Stata makes Nov 16, 2022 · Try the search command used by the Stata software to search Stata's keyword database. , 1 is first), age wt and sex are the child’s age, weight and sex. Basic Data Management in Stata. 2020. table is better, but tabulate, summarize() is faster. by, rolling, and statsby are allowed; see [U] 11. A few commands are so closely related that they are documented together, such as ranksum and median, which are both documented in[R] ranksum. PDF. Putting aside the statistical commands that might particularly interest you, here are 41 commands that everyone should know: Getting help. That is, u[i] u [ i] is the fixed or random effect and v[i, t] v [ i, t] is the pure residual. 1991b. Remarks and examples stata. Export tables to: Word®, Excel®. Why Stata. Cox, N. There is a glitch with Stata’s “stem” command for stem-and-leaf plots. 1. See [U] 27 Overview of Stata estimation commands for a list of other regression commands that may be of interest. Now generating tables of descriptive statistics for both categorical and continuous variables is easier than ever. dta”. Then I create small multiples for each trajectory group using the by Rather than typing commands at the keyboard, you can create a text file containing commands and instruct Stata to execute the commands stored in that file. variable rather than a 1/0 variable. docx successfully created "myresults. Also see [D] contract — Make dataset of frequencies and percentages [D] expandcl — Duplicate clustered observations [D] fillin — Rectangularize dataset (The last command is minus 5/letter l. Code: gen G = 1 if a == 1 & (b == 1 | b == 2) Comments: This generates a 1/. Stata Journal 4: 484–485. Also see[D] rename group for renaming groups of variables. Stata Journal 10: 507–539. Basic syntax. com Users can add new features to Stata, and some users choose to make new features that they have written available to others via the web. #2. Also see [D] clear — Clear memory [D] varmanage — Manage variable labels, formats, and other properties [U] 11 Language syntax Remarks and examples stata. The effects of the dummy variables are said to be absorbed. All features Nov 16, 2022 · These commands create Word documents, PDFs, and Excel files that insert results from Stata commands into formatted text and tables in your document. Stata tip 13: generate and replace use the current sort order. by without the sort option requires that the data be sorted by varlist; see[ D ] sort . Mar 9, 2020 · First, load the data by typing webuse systolic in the command box and clicking Enter. Note that results stored in r() are updated when the command is replayed and will be replaced when any r-class command is run after the estimation command. This page shows how to perform a number of statistical tests using Stata. by state: gen lag1 = x[_n-1] If there are gaps in your records and you only want to lag successive years, you can specify. com Remarks are presented under the following headings: Description of basic syntax Wide and long data forms Avoiding and correcting mistakes reshape long and reshape wide without arguments Missing variables Advanced issues with basic syntax: i() relationship between Stata datetimes and Excel datetimes. Mar 8, 2016 · Posts: 28244. B. Nov 16, 2022 · Stata fits fixed-effects (within), between-effects, and random-effects (mixed) models on balanced and unbalanced data. If you have more variables than can fit in a Stata matrix, regress will not work. MacDonald, K. You can Newson, R. Labeling data, variables and values. In Stata, use the command regress, type: Title stata. , Y= x1 + x2 + + xN) Technically, linear regression estimates how much Y changes when X changes one unit. The Command window can become a faster way of working because of the clean and regular syntax of Stata commands. ) 10. help, net search, search. To save a data file from Stata go to file – save as or Log files record everything that happens during a session, both what you type and what Stata produces in response. dta, appears in the tall History window to the left. . , of the regression model underlying the last run of anova. list make %PDF-1. Title stata. estat ptrends Parallel-trends test (pretreatment Oct 30, 2015 · "Say exactly what you typed and exactly what Stata typed (or did) in response. . mean— Estimate means 5 Example 3: standardized means Suppose that we collected the blood pressure data fromexample 2of[R] dstdize, and we wish toobtain standardized high blood pressure rates for each city in 1990 and 1992, using, as the standard, Sep 12, 2018 · My program - statacmds - just mimics the behavior of - getcmds -, and adds some functionality; the core mechanism of both programs is to parse the names of help files to identify commands. ) Compute multiple regression equation (vy is response, vone, vtwo, and vthr are predictors): regress vy vone vtwo vthr; Important Notes on “stem” command. Any if or in qualifier and weights should be specified directly with table, not within the command() option. Here is a file containing information about the kids in three families. If you want to fit one-way ANOVA models, you may find the oneway or loneway command more convenient; see[R] oneway and[R] loneway. Reprinted in Stata Technical Bulletin Reprints, vol. dta you need only say use auto and Stata knows to read in the file called auto. Jun 26, 2023 · Stata 18 offers another new command, dtable, that easily builds and exports a table of descriptive statistics, often called Table 1 in publications. bsample may be used in community-contributed programs. J. com describe — Describe data in memory or in a file DescriptionQuick start MenuSyntax Options to describe data in memoryOptions to describe data in a file Remarks and examplesStored results ReferencesAlso see Description describe produces a summary of the dataset in memory or of the data stored in a Stata-format dataset. When the do-file is run using the do-file editor all commands are executed subsequently. Nov 16, 2022 · Heterogeneous difference in differences (DID) When average treatment effects vary over time and over cohort, you can now use the new hdidregress and xthdidregress commands to estimate heterogeneous average treatment effects on the treated (ATETs). com) [by varlist1:] command [varlist2] [=exp] [if exp] [in. Posted on May 13, 2019 by Kai Chen. We will use the describe command to get descriptive statistics. Laura Hughes. If you are interested in MANOVA or MANCOVA, see [MV] manova First steps: Opening/saving Stata files (*. Stata generally requires you to spell out completely any command that can alter your existing data. These files are perfect for later going back and creating a Stata do-file. dm89: Dropping variables or observations with missing values. We want to summarize these variables for the different origins of the automobiles. That is, the test is carried out as W=k˘ F(k;d) rather than as (d k+1)W=(kd) ˘ F(k;d k+1), Nov 16, 2022 · With these tools, you can access Stata and Mata conveniently in an IPython kernel-based environment (for example, Jupyter Notebook and console, and Jupyter Lab and console), in other environments that support the IPython kernel (for example, Spyder IDE and PyCharm IDE), or when accessing Python from a command line (for example, Windows Command Whereas generate is used to create new variables, replace is the command used for existing variables. We call it ERMs for short. by varlist: stata cmd bysort varlist: stata cmd The above diagrams show by and bysort as they are typically used. ) preserve reshape long count_ t_, i(id) To get the behavior I want in the plot, I use a scatter plot but have them connected via c(L). 5 %ÐÔÅØ 21 0 obj /Length 2739 /Filter /FlateDecode >> stream xÚÝZ[ ÛÆ ~ß_Á·J€5žû% j4. Keeping Stata up to date. Let’s use the auto data file. search provides a list of references — references to the on-line help, references to the PDF documentation, references to articles that have appeared in the Stata Journal (SJ), and references to FAQs on the website, links to video tutorials, links to To create the new document myresults. 0 on a MacBook Air. The use command below gets the Stata data file called auto. For example, . Each section gives a brief description of the aim of the statistical test, when it is used, an example showing the Stata commands and Stata output with a brief interpretation of the output. If your working directory is already set to c:\mydata, just type. For example: In SAS, we can write if 2001 <= fyear <= 2010. Most Stata commands are verbs. frame framename { stata_command stata_command. To add the three stochastic equations we fit using reg3, we use forecast estimates: May 26, 2023 · When running a regression, we are making two assumptions, (1) there is a linear relationship between two variables (i. , X and Y) and. Stata’s Nov 16, 2022 · Every installation of Stata includes all the documentation in PDF format. Stata/BE can read datasets created by Stata/MP and Nov 16, 2022 · and, as previously mentioned, this is _n in Stata terms when referring to observations. (2005). dta (called the using dataset), matching on one or more key a command. sysuse auto . We use the notation. Using and saving Stata data files. com merge — Merge datasets DescriptionQuick startMenuSyntax OptionsRemarks and examplesReferencesAlso see Description merge joins corresponding observations from the dataset currently in memory (called the master dataset) with those from filename. New in Stata 18. Ermi has three antennae because the new commands handle three problems not usually handled together. If you do not find the command, look in thesubject indexin[I] Stata Index. Results from any summary-statistics command ; See New in Stata 18 to learn about what was added in Stata 18. 1Making Stata stop what it is doing 9. If any filename is specified without an extension, . We will illustrate the differences in these commands below. Since Stata data files end with . It is based on the R package developed by the Authors, and is computationally intensive. 101–104. Quick start Change the name of v1 to var1 rename v1 Mar 27, 2018 · Ermistatas is the creation of our arts-and-graphics department to represent Stata 15’s new commands for fitting Extended Regression Models—a term we coined. ssc install mediation. or a table for your paper in Word® that looks like. cmdlog creates command log files, and its basic syntax is Remarks and examples stata. Birth is the order of birth (i. 2019. by Stata commands. Stata will give us the following results:. Introduction. How do I use the Stata survey (svy) commands? observations in the estimation sample, Stata’s time-series commands require the data to be sorted and indexed by time, using the tsset command, before they can be used. This can be estimated by u2/W, where u2 is the estimate of sigma2 we had before. You can create a lot of different tables directly from the reimagined table command—from simple cross-tabulations all the ipolate— Linearly interpolate (extrapolate) values 3 Example 2 We have a dataset of circulations for 10 magazines from 1980 through 2003. I will state the rules, and then we will look at each in turn. Feb 22, 2019 · I am struggling to install the Stata command collin. Stata/MP and Stata/SE can read datasets created by Stata/BE. You can use the postestimation command predict to obtain predictions, residuals, influence statistics, and the like, either for the data on which you just estimated or for some other data. This module shows the general structure of Stata commands. Reprinted in Stata Nov 16, 2022 · You can frame change, issue the Stata commands, and then frame change back. exactly!" 3. (Ditto for help on all Stata commands. We provide two options to simplify bootstrap estimation. Operating system interface. Using or and and in single if qualifier. Stata is a command-based language. com append — Append datasets DescriptionQuick startMenuSyntax OptionsRemarks and examplesReferenceAlso see Description append appends Stata-format datasets stored on disk to the end of the dataset in memory. LaTeX. 4. However, all typed commands are lost once Stata is closed (unless you manually start a command log). Use hdidregress with repeated cross-sectional data and xthdidregress with panel data. Such files are called do-files because the command that causes them to be executed is do. Reading dates into Stata and using date variables. Royston, P. tsset is simply a way for you to tell Stata which variable in your dataset represents time; tsset then sorts and indexes the data appropriately for use with the time-series Nov 16, 2022 · Stata is now ready to help you create both standard and customized tables, whether you want a table for the web that looks like. A few commands are so closely related that they are documented together, such as ranksumand median, which are both documented in[R] ranksum. I use Stata 14. It is worth mentioning that the twin commands etable and dtable are both built on Mar 18, 2020 · Scatterplot with Multiple Variables. 08 Mar 2016, 15:02. Note that the last variable you type will be used for the x-axis. Watch A tour of power and sample size. This creates a table in Word that looks like. N. Not all the entries in the Base Reference Manual are Stata commands; some contain technical . Stata tip 114: Expand paired dates to pairs of dates. Learn about power and sample-size analysis. 1, pp. com rename — Rename variable DescriptionQuick startMenuSyntaxRemarks and examplesAlso see Description rename changes the name of an existing variable old varname to new varname; the contents of the variable are unchanged. For example, the following command tells Stata to create a scatterplot using length as the x-axis variable and weight and 2[GSU] 1 Introducing Stata—sample session The same command, sysuse auto. Whether you choose the dynamic document commands or the put* commands, you can create documents that are Reproducible. In fact, Stata provides a handy inrange Data Processing. I always type findit collin and then try to install the installation package. and more. However, iweights may not be used with the detail option; see [U] 11. save use append, merge compress. Stata is a little bit awkward when using and and or in if statement, compared to SAS. So what you want is. Stata Journal 21: 1047–1064. I would like to write something like: Code: replace rate=. The next step is to add all the equations to the model. putdocx save myresults. These commands run the Stata commands on the specified frame, and switch back to the original frame once they are finished. medeff (Hicks and Tingley, 2011) is the Stata command for implementing this approach by Imai. Another way of working with frames is . xtreg is Stata's feature for fitting fixed- and random-effects models. use mydatafile. io il fo ym em yx vf ig zf ur