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st: Why does streg allow both state fixed-effects and time invariant state variables?


From   Sepideh Modrek <smodrek@stanford.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Why does streg allow both state fixed-effects and time invariant state variables?
Date   Thu, 18 Feb 2010 16:07:44 -0800

Title: Why does streg allow both state fixed-effects and time invariant state variables?
Hi Stata users,
I am running a Gompertz survival model with no time varying variables.  I am looking at mortality within states and I include indicator variables for each state. In one model, I accidently included both the state indicator variable AND a state level variable. In the OLS world that would be a case for perfect collinearity and the coefficient on the state-level variable would not have been estimated, but in this case it was! My gut tells me that the estimates are wrong/uninterruptable statistical garbage... Am I right ?

Please an help would be great!


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