Hi Rick,
You have motivated me to create a page with comments on this issue
from a number of well-respected statisticians, including T. A. Ryan.
While all psychologists (and others) who conduct pairwise contrasts
should read this, I fear that only those following this thread will --
and they are doubtlessly a rather unusual and small group. Oh well.
Here is the url:
http://core.ecu.edu/psyc/wuenschk/StatHelp/Pairwise.htm . It is too
late in the day to make the page pretty, but I hope you find the
discussion interesting. If you wish to cite an authority on this, cite
Ryan's 1959 Psych. Bull. article. Yikes, psychologists should have
known about this since 1959, but most are still in the dark.
It really is a shame that most people who write introductory
statistics texts for psychology don't know much about the topic. I
wonder why that is.
Cheers,
Karl W.
________________________________
From: Rick Froman [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 03, 2007 10:18 PM
To: Teaching in the Psychological Sciences (TIPS)
Subject: RE: [tips] ANOVA, HSD, and LSD
Not that I doubt you Karl (you seem very educated on statistical issues)
but all the textbooks I have used talk about HSD as a post hoc test that
is only appropriate to use after finding significance with an ANOVA. Do
you have something I could reference to support this?
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