Re: ways to describe the MANOVA effect

Posted by Bruce Weaver on Jan 14, 2020; 8:21pm
URL: http://spssx-discussion.165.s1.nabble.com/ways-to-describe-the-MANOVA-effect-tp5738769p5738777.html

I like that advice.  My own observations suggest that more often than not,
people use MANOVA as a precursor to multiple ANOVAs.  They seem to believe
that a significant MANOVA buys protection against Type I error in the
subsequent ANOVAs in the same way that a significant omnibus F-test buys
protection for the subsequent t-tests when one uses Fisher's LSD (with 3
groups).  But as Huberty & Morris clearly say, it just ain't so!  For them,
it boils down to this:  If you have a multivariate question, use MANOVA; but
if you have a series of univariate questions, use a series of ANOVAs.  (In
the latter case, you might consider some kind of adjustment for
multiplicity--but that's another can of worms!)

https://pdfs.semanticscholar.org/ee6c/77c99c8e4530d0cccaedf85ed525fb22a02d.pdf



Rich Ulrich wrote
> As an expert in Manova, my advice has always been,
> "Avoid it when you can."  
>
> --- snip ---





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Bruce Weaver
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