On Fri, Aug 14, 2009 at 4:59 PM, Weichle, Thomas<[email protected]> wrote:
> Dear Statalisters,
> I'm trying to do a paired t-test on a matched sample after performing
> propensity score matching to assess differences in measured
> characteristics between treated and untreated individuals. I've used
> psmatch2 to perform the matching. I'm familiar with the syntax to do a
> paired t-test when there are 2 variables and we want to test whether
> they differ (ttest varname1 == varname2). However, the way my data is
> set up after performing the matching doesn't have 2 separate variables.
> For example, there is 1 column for each measured characteristic, an
> indicator for treatment status, and another variable indicating which
> control the treated was matched to. Does anyone have any experience
> trying to perform this matched individuals paired t-test? Maybe I don't
> have my data set up correctly.
You're correct, you need to -reshape- your data first. See -man
reshape- for more information.
Neil
--
"The combination of some data and an aching desire for an answer does
not ensure that a reasonable answer can be extracted from a given body
of data." ~ John Tukey (1986), "Sunset salvo". The American
Statistician 40(1).
Email - [email protected]
Website - http://slack.ser.man.ac.uk/
Photos - http://www.flickr.com/photos/slackline/
*
* 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/
