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st: newbie question: nonsig posthoc after sig anova


From   Jim.Seward@sunhealth.org
To   statalist@hsphsun2.harvard.edu
Subject   st: newbie question: nonsig posthoc after sig anova
Date   Mon, 18 Aug 2003 08:29:24 -0700

I'm a new member to the list.  My background is in neuropsychology rather
than statistics so please excuse this naive question.  I did a simple ANOVA
comparing a mean score across five groups.  The ANOVA was barely
significanct (0.04) but in post hoc tests using Bonferroni, Scheffe and
Sida none of the group mean differences were near significant (the largest
group mean difference had a p of 0.14).

Any explanation is appreciated.

Thanks,
Jim Seward

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