
From  Richard Williams <Richard.A.Williams.5@ND.edu> 
To  statalist@hsphsun2.harvard.edu 
Subject  Re: st: Re: adjusted r square 
Date  Tue, 20 Feb 2007 21:11:45 0500 
At 10:34 AM 2/20/2007, Ulrich Kohler wrote:
It is just a simple fact that I can explain more variance with an additional variable.One other point: It is true that in a sample, R^2 will always go up as you add more variables. This is because, even if the population coefficient is zero, sampling variability will cause the estimated coefficient to be nonzero. But, if we had the entire population, there would be no requirement that adding another variable result in more explained variance.
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