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From | Vic Z <victerzj@yahoo.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: create a comparison group |
Date | Tue, 1 Mar 2011 12:58:24 -0800 (PST) |
Dear Statalister: I have a problem with stata about how to create a comparison group for my study. Right now I have a sample with 230 firms. I simply need to create a comparison group with 230 other firms, which should be in the same industry, with similar size and similar listing age to my orginal 230 firms. After that I will group two sample together and run some regression. My problem is how I can tell stata to pull out those 230 firms from compustat to have a one-one matching with my orginal data sample so that I will have 230 pair firms. In each pair, the two firms will be almost identical. Thank you in advance. Jian * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/