Create a new data set that contains only one variable, id, and contains only the 40 particular id's that you want to keep. Using the subpopulation option(s) is extremely important when analyzing survey data. list if radius >= 3000) infile : read non-Stata-format dataset (ASCII or text file) input : type in raw data : list : lists the whole dataset in memory (you can also list only certain variables) log : save or print Stata ouput (except graphs) lookup If I wanted to perform a regression on the observations of years 1994 to 1996, instead of the entire dataset, whats the command? 2.0 Demonstration and explanation. For each group, I would like to determine the mean of a variable from all other observations in the group that are within a certain percentage of the focal observation's value, but excluding the focal observation from the mean. Stata: Generating variables in a loop using tuples local macro. In Stata, the .sample command selects random samples of the data set in memory and removes unselected observations from the data set.. So, my question is: How can I create a subset of my data which includes only the companies who did violate a covenant, but not only the obs. Is there a way to do e.g. 0. From: Nick Cox
References: . When the commands keep and drop are specified without variable names, they keep and drop observations according to some condition specified in an if statement. Suppose you want to randomly draw a sample of 100 observations from the current data set. for which the dummy variable equals "1", but all obs. From: "Gerard Solbrig" Re: st: Looping within a subset ⦠lets you select a subset of observations (e.g. 3917 obs., I want to keep all obs. I tried to add -if- after -ttest-, as the way in regression, but stata shows that -if- cannot follow -ttest-. for those 2992 companies ("Violators") who did violate a covenant at least once. Follow-Ups: . I could just delete the first year, but then the model becomes useless because there are too few observations, i somehow need to take the model built around all the observations and then restrict the sample size to 1994-1996 Here's another approach. A) Use keep and drop with an if statement to subset observations. ... Local macros for subset of observations. Dear statalists, I have a question of how to run -ttest- for a subset of observations. Then open (-use-) your original data set in Stata and run Save that data set: I'll call it keepers.dta. Stata has two subpopulation options that are very flexible and easy to use. I know I can drop duplicates, but I need them later. In Stata, words are or could be separated by spaces (other than being bound by double quotes); in the case of Stata variable names, distinct variable names are always distinct words. st: Looping within a subset under a certain condition. use hs1, clear . for which "newviol" equals "1", i.e. Thank you! tab of only the observations with a unique id? While it would be easy to keep only the obs. First, load a data set, and then run the following command with the count option:. ps I work in Stata 13.1/IC on Mac. Any thoughts? Re: st: Looping within a subset under a certain condition. 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