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Re: st: anova mtest with alternate error term


From   khigbee@stata.com
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: anova mtest with alternate error term
Date   Mon, 16 Jul 2007 13:07:57 -0500

Al Feiveson <alan.h.feiveson@nasa.gov> asks:

> In Stata 9, I wanted to test some multiple contrasts after anova
> using the matrix method (syntax 1) - but there doesn't appear to be a
> way to specify an error term for these multiple tests other than the
> default "residual". Apparently, only syntax 3 (specified effects) allows
> this. Am I missing something, or do I have to do this calculation by
> "hand"?

You are correct.  Only syntax 3 of -test- after -anova- (type
-help anova postestimation##test- in your Stata Viewer) allows
you to directly use a term other than residual error as the error
term.

The steps to get what you are after are found in the FAQ

    http://www.stata.com/support/faqs/stat/singledof.html

(see especially the last part of the FAQ).

I agree that it would be nice if syntax 1 had an option for
specifying other error terms.  It is on my list to consider for
future development.

Ken Higbee    khigbee@stata.com
StataCorp     1-800-STATAPC

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