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st: saving a sample after a regression


From   "william.miles" <[email protected]>
To   [email protected]
Subject   st: saving a sample after a regression
Date   Mon, 12 Mar 2007 13:47:38 -0600

Hi-
I am running regressions with several variables, and not all observations have 
data on all variables.  I run a regression of Y on X, and use say 1,000 
observations.  Then I run a regression of Y on X and Z, and because not all 
observations have Z, I only get a sample of 800 observations.  Is there any 
way to save the sample from the latter regression, so I can then run the 
original regression of Y on only X, but using only the 800 observations that 
include Z, without having to go throught the data by hand?
Thanks,
Bill

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