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From | Richard Goldstein <richgold@ix.netcom.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: Troubleshooting comparison of means across groups |
Date | Thu, 28 Jun 2012 10:19:28 -0400 |
yes, look at the help file and you will see that you need a comma before the "by" Rich On 6/28/12 10:12 AM, Kerry MacQuarrie wrote: > Hi all, > > I am trying to run t tests to compare means of some (continuous) variables > across groups. However, I'm running in to some puzzling error messages. > > If I run the code ttest varname by(groupvar), I get: "factor variables and > time-series operators not allowed". Any ideas on where to start looking to > troubleshoot this? > > Thanks for any suggestions. > Kerry > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Kerry MacQuarrie > NSF Fellow and CSDE Trainee > Sociology Department > University of Washington * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/