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RE: st: coefficient interpretation in OLS

From   "Lynn Lee" <>
To   <>
Subject   RE: st: coefficient interpretation in OLS
Date   Fri, 17 Aug 2012 21:48:58 -0700

Thank you, Nick. 

Best Regards,
Lynn Lee

-----Original Message-----
[] On Behalf Of Nick Cox
Sent: Friday, August 17, 2012 2:07 AM
Subject: Re: st: coefficient interpretation in OLS

This really is covered in every decent regression text (in your case,
perhaps, an econometrics text). It's an inevitable consequence of any
correlations between X4 and X1, X2, X3.


On Fri, Aug 17, 2012 at 11:25 PM, Lynn Lee <> wrote:

> When I run simple OLS regression or pooled OLS regression, I find if I add
> more variables to the model, the coefficient on specific explanatory
> variable can vary in magnitude. For example,
> Y1=beta+beta1*X1+beta2*X2+beta3*X3+error term;
> Y2=alpha+alpha1*X1+ alpha2*X2+ alpha3*X3+ alpha4*X4+error term.
> The absolute value of estimates of beta1 or alpha1 can increase or
> decrease.  I am not confident to explain this theoretically. Is it related
> to potential endogeneity issue?
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