[R] lm -- significance of x coefficient when I(x^2) is used
gb at stat.umu.se
Wed Sep 27 08:42:05 CEST 2000
On Tue, 26 Sep 2000, Bill Venables wrote:
> At 10:12 26/09/00 +0200, Michael Pronath wrote:
> > In "Modern Applied Statistics with S-Plus" 3rd ed., footnote on page 153
> > regarding a model lm(Gas~Insul/(Temp+I(Temp^2))-1,whiteside), I read
> It comes back to the question of where would someone have good reason a
> priori to pose the question "Is the curve flat HERE, and this very special
> temperature?" If there is no good reason to pose the question, why force
> the model to conform to this arbitrary restrictrion? Notice that this is
> not quite the same thing as variable selection where Occam's principle is
> the good reason for considering whether or not coefficients are zero.
Where can I find a description of "Occam's principle"? I vaguely recall
"Occam's razor", which I guess is the same thing?
Göran Broström tel: +46 90 786 5223
Department of Statistics fax: +46 90 786 6614
SE-90187 Umeå, Sweden e-mail: gb at stat.umu.se
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