Re: [R] R2 always increases as variables are added?

From: Alberto Monteiro <albmont_at_centroin.com.br>
Date: Mon, 21 May 2007 15:29:44 -0200

Paul Lynch wrote:
>
> I don't think it makes sense to compare models with
> and without an intercept term. (Also, I don't know what the point of
> using a model without an intercept term would be, but that is
> probably just my ignorance.)
>
Suppose that you are 100% sure that the intercept term is zero, or so insignifantly small as not to matter. For example, if you are measuring the density of some material, and you determine a lot of pairs (mass, volume), you know that mass = density * volume, with intercept zero.

Alberto Monteiro



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