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| From | Maarten Buis <maartenlbuis@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: impute with draws from random distribution |
| Date | Wed, 22 Jun 2011 13:29:08 +0200 |
On Wed, Jun 22, 2011 at 11:32 AM, D-Ta wrote: > Otherwise, the start date cannot be used as a control variable in the > matching approach. With your advice to generate dummies for missing values > (and to control for those) you cant (by definition) reach common supported > between the treated and the comparison group. The strength of matching is that it prevents you from comparing groups that cannot be compared. You try to circumvent that strength, which is not a good idea. Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * 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/