|Date: ||Mon, 16 Dec 1996 11:54:56 +0000|
|Reply-To: ||Ron Scholte <scholte@PSYCH.KUN.NL>|
|Sender: ||"SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>|
|From: ||Ron Scholte <scholte@PSYCH.KUN.NL>|
|Content-type: ||text/plain; charset="us-ascii"|
does somebody have any suggestions with respect to the following problem?
I am running ANOVA with 3 independent variables (sex, grade and
clustermembership). Because of unbalanced data (unequal cell sizes) and the
probability of interaction between rows and colums, Type III Sums of
squares are recommended, and I therefore apply the regression approach (
'Method= Unique'). I have used the Scheffe post-hoc test to test for main
effects, e.g. to explore the differences between different grades when
ANOVA reports main effects for grade.
It turns out that ANOVA sometimes gives sign. main effects, but Scheffe
says 'no two groups are different at the .050 level'. Is Scheffe
appropriate as a post-hoc test for main effects when the ANOVA regression
approach is used? If not, what test is?
thanks in advance