Sripal,
You have several strata, say, N 2x2 tables (or effect sizes and their
variances/standard errors), you can test for interaction (assuming that
interaction in this case means lack of homogeneity) using either the
Cochran Q-Statistic or the Breslow-Day test.
-metan- calculates automatically the Q-statistic, whereas the Breslow-Day
test requires the option breslow as well as raw data (complete 2x2
tables). Assuming you have raw data (2x2 tables) as a b c d (four
collumns), type, for instance:
metan a b c d, or random breslow
or
metan a b c d, rr fixedi
see the several options you have on the help file.
Tiago
*
* 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/
