Re: st: Relative Importance of predictors in regression

[Richard Goldstein <richgold@ix.netcom.com>]

Hi Sam,

a little more seriously, consider the following two models:

1. y=b0 + b1*age + b2*female + b3*white
2. y=b0 + b1*age + b2*female

so, there is no reason to expect that either b1 or b2 would be the same
in these two models -- that I think is (part of) David's point

I don't understand the "hold constant" part and how it might apply here,
or, really elsewhere when talking about the "effect" of a
right-hand-side variable; but I don't think that is what you are talking
about; so, I think that at least part of this discussion has people
talking past each other. Further, I don't think that this discussion is
related to the subject line either.

Rich

On 11/6/13, 2:22 PM, Lucas wrote:
> Hi Rich,
> 
> Depends on which of us you ask.  I'd say if you compare a male w/ 9
> YrsSchl and a male w/ 8YrsSchl you've held sex constant and b1 is the
> difference in Y associated with that one year difference in schooling.
>  I think David H. would say that you've held nothing constant.  Is
> that a correct interpretation of your claim, David H.?
> 
> Sam
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