multi vs univariate tests in GLM RM anova

Posted by Zdaniuk, Bozena-3 on Dec 01, 2011; 2:03am
URL: http://spssx-discussion.165.s1.nabble.com/multi-vs-univariate-tests-in-GLM-RM-anova-tp5037385.html

Hello, i am running one within, two between subject RM ANOVA using GLM. The multivariate tests show all within-subject effects as significant but the univariate tests show two of those effects as non-significant. My intuition is to use the univariate tests but I don't know exactly why (and whether it is what I should do). Why would there be such a difference between the two types of tests? My N is very large (70, 000)
thanks in advance for help.
bozena zdaniuk