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


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Stata has disappointing support of contrasts/multiple comparisons in mixed ANOVA
Date   Tue, 11 Mar 2008 14:52:11 -0000

Disappointment and embarrassment being noted, what would be your top
candidates for inclusion? 
(And will others then agree, showing a consensus among people who use
this 
kind of thing on what is justifiable and useful?)  

StataCorp has a certain historical timidity about implementing stuff
when the practitioners of a field seemingly 
can not even decide on procedures and every expert contributes a
different approach. Rightly or wrongly, multiple
comparisons has that reputation. 

Nick 
n.j.cox@durham.ac.uk 

Feiveson, Alan H. (JSC-SK311)

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.

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?


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