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st: samplig firms in a panel and reconciliation of samples


From   "west--\@libero\.it" <west--@libero.it>
To   "statalist" <statalist@hsphsun2.harvard.edu>
Subject   st: samplig firms in a panel and reconciliation of samples
Date   Thu, 9 Nov 2006 15:30:29 +0100

Dear Stata users,

I'm a beginner with Stata and I am wondering if any of you may help me to make subsamples of HIGH and LOW firms (in terms of "var1" and then of "var2") in a panel data analysis. My unbalanced panel is made up of a lot of variables, an "id" (fro 1 to 200) and a "year" variable (1995 to 2005, but some years may not be available).
Well, the sample splits should be achieved as follows: each firm assigned to a high (or low) category according to the firmís "var1" median characteristics (measured over time) compared with the median characteristics of all firms. Again in terms of "var2". After the two columns (of 1 and 0) are made (please, tell me how according to these sample splitting...) are performed, I would include only those firms that are common to the two samples (e.g. HIGH var 1 and HIGH var 2). Can anyone help me with the commands? 
Thank you very much,

D.



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