Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
From | Auditya Shamsuddin <auditya46@gmail.com> |
To | "statalist@hsphsun2.harvard.edu\"" <statalist@hsphsun2.harvard.edu> |
Subject | st: propensity score matching in 2 stages(if match is not found inside region then match outside) |
Date | Tue, 27 Nov 2012 19:15:50 -0600 |
Fellow Stata-users I am a relatively new STATA user. I am using psmatch2(version 4.0.4 10nov2010 E. Leuven, B. Sianesi) to find out impact of natural disaster on child labor. Based on the propensity to be affected by natural disaster, I would like to match children within same district(same as county in US) i.e., a natural disaster affected child will be matched with another child from the same district who has similar likelihood of being affected by the natural disaster but who is not. To ensure good quality match within the district, I specify the caliper to be of 0.25 standard deviation of propensity score. But problem with this condition is that 35 out of my 105 treatment observations stay out of common support and, this cannot be used for estimating average treatment effect on the treated. So, I would like to match these 35 observations, which did not find close match within district, with control observations from outside the district, if close matches exist within 0.25 standard deviation of propensity score. If a treatment fails to find a match within the specified caliper even outside the region/district, I will discard that from the analysis. In brief i) First stage: matching has to be done within district. ii) In Second stage the unmatched treatments remaining from the first stage will be tried to match with control observations from outside the region/district. How can I use psmatch2 for this? Or, any other package in Stata? I really lack knowledge on writing program in STATA. Can anyone save me with this, specifically, how to write code to execute my model. I appreciate your thought and instruction in advance. SIncerely Auditya * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/