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From | Nick Cox <njcoxstata@gmail.com> |
To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
Subject | Re: st: -foreach- loop to fit regression at each level of a variable |
Date | Tue, 19 Nov 2013 12:57:42 +0000 |
Please read the whole of my reply and the FAQ referred to. Nick njcoxstata@gmail.com On 19 November 2013 12:47, Milena Przheska <milena.przheska@cosmicdevelopment.com> wrote: > Yes, I fixed that with the following: > > > levelsof sample, local(sample_levels) > > but the -foreach- still does not work > > > On Tue, Nov 19, 2013 at 1:43 PM, Nick Cox <njcoxstata@gmail.com> wrote: >> Also, there is no legal syntax >> >> -egen local- >> Nick >> njcoxstata@gmail.com >> >> >> On 19 November 2013 12:42, Nick Cox <njcoxstata@gmail.com> wrote: >>> Just looking at the help for a few seconds establishes that >>> >>> 1. There is no -levelsof()- function for -egen-. >>> >>> 2. -foreach ... of- requires a key word specifying a list type to follow. >>> >>> Also you should learn in type in Stata >>> >>> . search foreach >>> >>> to find resources. In this case, >>> >>> http://www.stata.com/support/faqs/data-management/try-all-values-with-foreach/ >>> >>> is most focused on your problem. >>> >>> Nick >>> njcoxstata@gmail.com >>> >>> >>> On 19 November 2013 12:34, Milena Przheska >>> <milena.przheska@cosmicdevelopment.com> wrote: >>> >>>> I am trying to fit the same logistic regression model using different >>>> samples from a data set and I am wondering if it is even possible to >>>> use a -foreach- loop to estimate regression models for each sample >>>> (indicated by a variable). >>>> >>>> I use the variable 'sample' to indicate the sample, but instead of >>>> writing the command over and over for each sample, I tried to do this >>>> with a -foreach- loop, something like this: >>>> >>>> egen local sample_level = levelsof(sample) >>>> >>>> foreach n of sample_level { >>>> logistic outcome var1 var2 var3 if sample_level==`n', vce(cluster id) >>>> } >>>> >>>> As always, I would appreciate your help. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/