testing for linearity

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Article #738

#738

From: mgranaas
Date: Tue, 15 Dec 1992 15:23

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The simplest test for linearity that I have found is to calculate the
conditional means of y on x.  Follow that with plotting and calculating
the correlation coefficient.  If your correlation is near +/- 1 your
data are probably linear in form.  If not, the plot should show a fairly
clear picture of what shape the relation takes.  If the plot does not
show a fairly clear picture, then you do not have sufficient data at
each level of x to dampen out the error.  (This happens frequently, and
at that point you're back to square one--sorry)

Michael Granaas
Dept. of Psychology
University of South Dakota
mgranaas@charlie.usd.edu

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Subject: testing for linearity
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Date: Tue, 15 Dec 1992 15:23:34 GMT
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