st: testing equality of variances with repeated measures

[Jim.Seward@sunhealth.org]

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

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/