On Tue, 3 Apr 2007, Rick Froman went:
How would you interpret an ANOVA result where the F-test was significant but none of the multiple comparisons were significant in an HSD comparison?
Initially, I wrote a response as follows: "Off the top of my head, I would say: An overall effect was detected, but the sample sizes within individual cells were not sufficiently large to attribute the effect to any specific pairwise comparison. "Then I would talk, with due caution, about what it LOOKED like." Then I did a Google search and found an explanation that's more abstruse, but still seems to invoke the problem of small sample sizes: <http://www.ats.ucla.edu/STAT/spss/library/manglm.htm> (scroll down to the section "My tests don't agree!"). Note that the explanation does *not* seem to be that you're missing "some more complicated contrast among the means." --David Epstein [EMAIL PROTECTED] --- To make changes to your subscription go to: http://acsun.frostburg.edu/cgi-bin/lyris.pl?enter=tips&text_mode=0&lang=english
