Re: SAMPLE SPIT QUESTION

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#3653

From: Karl L. Wuensch
Date: Wed, 18 Dec 1991 15:39

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     It is hard to evaluate your question without additional data.  Why
did your associate want to dichotomize the questionnaire scores?  Why not
just do a Pearson r, Spearman, Kendall tau, or other such correlation
coefficient between the questionnaire scores and the cholesteral scores?
Does a scatterplot show a nonlinear effect?  A nonmonotonic effect?  For
the t-test done, do the within-group distributions appear normal?  Is there
great heterogeneity of variance and if so were df corrected therefor?
In my experience psychologists often needlessly categorize quantitative
variables.

      Karl L. Wuensch, Dept. of Psychology, East Carolina Univ.
      Greenville, NC  27858-4353, PSWUENSC AT ECUVM1 (BITNET)

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From: PSWUENSC@ECUVM1.BITNET (Karl L. Wuensch)
Newsgroups: bit.listserv.stat-l
Subject: Re: SAMPLE SPIT QUESTION
Message-ID: <STAT-L%91121814584671@VM1.MCGILL.CA>
Date: 18 Dec 91 15:39:49 GMT
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X-To:         Richard Leickly <RICHARD@UWAVM.BITNET>, STAT-L@MCGILL1.BITNET
In-Reply-To:  Your message of Tue, 17 Dec 1991 10:26:03 PST