Posted by
Swank, Paul R on
Nov 22, 2006; 10:00pm
URL: http://spssx-discussion.165.s1.nabble.com/More-on-Repeated-Measures-tp1072284p1072289.html
The multivariate tests assume multiariate normality and homegenous
variance covariance matrices across groups, the univariate repeated
measures assumes homegeneity of variance covariance matrices, sphericity
of the variance covariance matrix and normality of the residuals. The
univariate repeated measures is typically mor sensisitve since the
violation of sphericity tends to result in more significant results. The
tests are different and do have different degress of freedom.
Paul R. Swank, Ph.D.
Professor, Developmental Pediatrics
Director of Research,
University of Texas Health Science Center at Houston
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
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S Elgie
Sent: Wednesday, November 22, 2006 2:39 PM
To:
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Subject: More on Repeated Measures
Thanks so much for all help received on repeated measures. I am
emboldened to ask a further question. When one does a multivariate
repeated measures analysis, there are two tables of multivariate
results. The first is labelled 'Multivariate Tests' and contains tests
of the intercept and within subject factor. (For now let's assume just
one repeated factor). The second table is labelled 'Tests of
Within-Subjects Effects' and contains just the tests of the repeated
factor. I have not ever had the problem of these two tables giving
substantially different answers, such as one significant and the other
not. But the numbers and degrees of freedom etc.
are different and I have never been sure why and particularly not sure
which one should be reported.
Thanks again,
Susan
QQ Consulting
Toronto Canada
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