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Re: st: Stata has disappointing support of contrasts/multiple comparisons in mixed ANOVA


From   David Airey <david.airey@Vanderbilt.Edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Stata has disappointing support of contrasts/multiple comparisons in mixed ANOVA
Date   Tue, 11 Mar 2008 09:04:30 -0500

On Mar 11, 2008, at 8:26 AM, Feiveson, Alan H. (JSC-SK311) wrote:

Hi - I have been repeatedly asked by people who I convinced to buy
Stata how to do multiple comparisons of interaction effects under more
"complicated" anova models such as those with at least one factor random
and possibly with repeated measures, etc. Apparently Stata does not have
a built-in command/option for multiple comparisons for anything but a
one-way model and does not even support approximate methods for such
comparisons other than using xtmixed and creating all the contrasts and
tests "by hand". Even then, further processing has to be undertaken to
account for multiple testing.

There are a couple Stata FAQs related to ANOVA testing:

http://www.stata.com/support/faqs/stat/#anova

From the number of helper programs written by Phil Ender and others at ATS UCLA, there may be helpfulness in your advice to your colleagues!

http://www.ats.ucla.edu/stat/stata/topics/anova.htm

Side by side by side post hoc analysis of interactions from a mixed ANOVA in Stata and SPSS and SAS and R would be enlightening.




Embarassingly enough, I have had to refer people to SAS to do these
types of comparisons without a lot of customized programing. Am I
missing something or is Stata really woefully deficient in this area?

Al Feiveson

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