Date:         Wed, 12 Mar 2003 09:13:12 -0600
Reply-To:     Thompson Bill T Contr USAFSAM/FEC <Bill.Thompson@brooks.af.mil>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Thompson Bill T Contr USAFSAM/FEC <Bill.Thompson@brooks.af.mil>
Subject:      Post Hoc mystery
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In writing the code for performing a MANOVA I included the code for
performing post hoc tests on the main effects before knowing if they were
significant.  Interestingly the results showed no main effect for my
variable but when looking at the bonferroni (only 3 levels of indep. var.)
post hoc it showed significance.  Even more interesting is that in another
analysis the exact opposite occurred where there was a significant main
effect but post hoc analysis did not identify a significant relationship.

Your thoughts please and any help in interpreting these results is greatly
appreciated.


Bill

"They that can give up essential liberty to obtain a little temporary safety
deserve neither liberty nor safety."
- Benjamin Franklin 1759