Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: Troubleshooting comparison of means across groups


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/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index