I'm even less conservative than Stephen. I would not apply the
Bonferroni adjustment. After all, these are PLANNED comparisons, eh?
Not that I really thing that "planned" means much -- but I do think that
downwards adjustments of per comparison alpha have done more harm than
good. The Type I Boogie Man under your bed is really a myth. The Type
II Boogie Man in your closet is for real. :-)
Cheers,
Karl W.
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Wednesday, January 07, 2009 5:03 PM
To: Teaching in the Psychological Sciences (TIPS)
Subject: [tips] ANOVA question (was cross-cultural)
(note change of subject header: cross-cultural scientific screw-up is
not
what this is about, for sure)
On 7 Jan 2009 at 14:54, Steven Specht wrote:
> What are TIPSters views of various post hoc tests after doing
> a 2 X 2 ANOVA with repeated measures on one of the variables.
> Tukey's HSD isn't really appropriate as it would adjust for all four
> comparisons when I am only interested in comparing across the repeated
> measures variable (that is, a total of two comparisons rather than \>
four).
I'd go with two separate paired t-tests, with a Bonferroni correction
(instead of testing at p = .05, do it at p = .025). Easy, quick,
conservative.
Stephen
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Stephen L. Black, Ph.D.
Professor of Psychology, Emeritus
Bishop's University e-mail: [email protected]
2600 College St.
Sherbrooke QC J1M 1Z7
Canada
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