[19127] in s-news-athena
[S] Pr(F) in anova()
daemon@ATHENA.MIT.EDU (Doug Moog)
Tue Sep 7 13:47:16 1999
Message-Id: <4.1.19990907133810.00941090@pop.cwru.edu>
Date: Tue, 07 Sep 1999 13:41:44 -0400
To: s-news@wubios.wustl.edu
From: Doug Moog <dbm3@po.cwru.edu>
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HI,
I'm running Splus 2000, Windows 95, and I'm confused about what I'm reading
in the output of anova() applied to a linear model, lm(). I will run a
model with one or more terms and get a certain set of F and Pr(F) values.
Then when I add a new term to the model, the F values of the previous terms
increase, and their Pr(F) values decrease. But since the terms are added
sequentially, shouldn't the F values remain the same when you add a new
term? How could the earlier terms be affected by the later terms? Or is it
not sequential after all? The anova() output says "Terms added sequentially."
Thanks
_________________________________________________________________________
Douglas B. Moog, Ph.D. phone: 216-368-1688
Senior Research Associate fax: 216-368-3691
Dept. of Geological Sciences internet: dbm3@po.cwru.edu
Case Western Reserve University
Cleveland, OH 44106-7216
USA
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