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st: testing equality of variances with repeated measures


From   Jim.Seward@sunhealth.org
To   statalist@hsphsun2.harvard.edu
Subject   st: testing equality of variances with repeated measures
Date   Wed, 19 May 2004 15:57:24 -0700



I have some data that consists of 5 repeated administrations of a test,
given annually:

test1 test2 test3 test4 test5

Doing a  manova followed by manovatest shows that the means are not
significantly different; however, inspection of the data suggests that the
variance increases with time.  What is the best way to test this in Stata?

Thanks,
Jim Seward

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