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Re: st: Troubleshooting comparison of means across groups

From   Richard Goldstein <>
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"


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
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