On Apr 29, 2015, at 9:14 AM, pureum kim <pureum.kim(a)usc.edu> wrote: Dear CEM List members, I have about 45 treatment firms and I am trying to create a control sample. Using that control sample, we plan to collect additional information about the firm, which would take some time and effort. I was wondering if I could use different CEM specifications for each treatment firm to get the most accurate control firms. The issue is that for some treatment firms, I get a huge strata, on the other hand, for other groups I have two control firms. I was wondering if I could use a more stringent matching criteria for those treatment firms with large number of control firms and a less stringent matching criteria for those that have a low number of control firms. My concern is how would I run a regression later because the weights are derived from different matching specifications. Or does it matter? Thank you for your time and consideration. Kind Regards, Pureum Kim - -- cem Mailing List, served by HUIT Send messages: cem(a)lists.gking.harvard.edu [un]subscribe Options: http://lists.gking.harvard.edu/?info=cem More information on cem: http://gking.harvard.edu/cem Cem mailing list Cem(a)lists.gking.harvard.edu To unsubscribe from this list or get other information: https://lists.gking.harvard.edu/mailman/listinfo/cem