Stuart,
What do you mean by, "on purely logical grounds." If there were four
groups, the first two might differ from the last two (one possible
nonpairwise contrast), but this would not necessarily mean that a
pairwise comparison would be significant.
- Mike
Michael T. Scoles, Ph.D.
Associate Professor of Psychology & Counseling
University of Central Arkansas
Conway, AR 72035
501-450-5418
>>> "Stuart McKelvie" <[EMAIL PROTECTED]> 4/3/2007 4:57 PM >>>
Dear Rick,
Because of the protection for Type I error, the largest and smallest
mean may indeed not differ with the post hoc test.
But I would argue that they MUST differ on purely logical grounds.
Stuart
______________________________________________
Stuart J. McKelvie, Ph.D.,
Department of Psychology,
Bishop's University,
2600 College Street,
Sherbrooke,
Qušbec J1M 0C8,
Canada.
E-mail: [EMAIL PROTECTED]
or [EMAIL PROTECTED]
Phone: (819)822-9600, Extension 2402
Fax: (819)822-9661
Bishop's Psychology Department Web Page:
http/:www.ubishops.ca/ccc/dev/soc/psy
__________________________________
> -----Original Message-----
> From: Rick Froman [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, April 03, 2007 5:39 PM
> To: Teaching in the Psychological Sciences (TIPS)
> Subject: [tips] RE: ANOVA interpretation
>
> That's the funny thing. I would assume that, too. But
> although the overall F-test was significant, there was no
> statistically significant difference using the HSD test,
> between the largest and smallest mean. I have to imagine this
> is somewhat rare but it just doesn't seem as if it should be
> a mathematical possibility. I think it could be due to the
> type of error-rate that a test is designed to control.
>
> Rick
>
> Dr. Rick Froman, Chair
> Division of Humanities and Social Sciences Box 3055
> x7295
> [EMAIL PROTECTED]
> http://www.jbu.edu/academics/hss/faculty/rfroman.asp
>
> Proverbs 14:15 "A simple man believes anything, but a prudent
> man gives thought to his steps."
>
>
> -----Original Message-----
> From: Stuart McKelvie [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, April 03, 2007 4:23 PM
> To: Teaching in the Psychological Sciences (TIPS)
> Subject: [tips] RE: ANOVA interpretation
>
> Dear Rick and others,
>
> I would say this for sure: the biggest and smallest means
> must logically be different!
>
> I do not understand the claims about the Scheffš test - it is
> extremely conservative.
>
> Stuart
>
> ______________________________________________
> Stuart J. McKelvie, Ph.D.,
> Department of Psychology,
> Bishop's University,
> 2600 College Street,
> Sherbrooke,
> Qušbec J1M 0C8,
> Canada.
>
> E-mail: [EMAIL PROTECTED]
> or [EMAIL PROTECTED]
> Phone: (819)822-9600, Extension 2402
> Fax: (819)822-9661
>
> Bishop's Psychology Department Web Page:
> http/:www.ubishops.ca/ccc/dev/soc/psy
> __________________________________
>
>
> > -----Original Message-----
> > From: Rick Froman [mailto:[EMAIL PROTECTED]
> > Sent: Tuesday, April 03, 2007 2:50 PM
> > To: Teaching in the Psychological Sciences (TIPS)
> > Subject: [tips] ANOVA interpretation
> >
> > 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?
> >
> > Rick
> >
> >
> > Dr. Rick Froman, Chair
> > Division of Humanities and Social Sciences Professor of Psychology
> > John Brown University 2000 W. University Siloam Springs, AR 72761
> > [EMAIL PROTECTED]
> > (479) 524-7295
> > http://www.jbu.edu/academics/hss/faculty/rfroman.asp
> >
> >
> >
> > "Pete, it's a fool that looks for logic in the chambers of
> the human
> > heart."
> > - Ulysses Everett McGill
> >
> >
> >
> >
> > ---
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> >
> >
>
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