st: Using the variables from one sw-result in another regression

[Torbj�rn Lindquist <torbjorn.lindquist@econ.umu.se>]

I am trying to identify the variables to used for matching. To do this I 
am using a method for identification of variables described in an 
article by de Luna and Waerenbaum (2005). They suggest that one should 
make an OLS regression of the outcome and use the significant variables 
in a probit on the treatment indicator. The variables that are 
significant in the last regression is affecting both treatment and 
outcome and they are therefor relatively good variables to include in 
the matching.

I use the sw command to see what variables passes the significance test. 
The question is, is there some way I can get the list of variables from 
the first regression into the second without having to type them in 
manually? It would help alot since I will do this for a large number of 
samples.

Regards
Torbj�rn Lindquist
PhD Student
Department of Economics
University of Ume�

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