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st: Significance test with -pscore- and -attnd-

From   Lukas Borkowski <>
To   "" <>
Subject   st: Significance test with -pscore- and -attnd-
Date   Fri, 9 Aug 2013 17:32:23 +0200

Dear Statalist,

I am using Stata 12.1 and run an impact evaluation on a two-period panel dataset using -pscore- and related commands (written by Sascha O. Becker and Andrea Ichino). I got myself a bit confused and would really appreciate your help:

After running -pscore- to estimate the propensity score using the first panel round (baseline data) only, should I 

- keep only matched observations?
- keep only observations within the common support?
- estimate the ATT with -attnd- using both panel rounds or only the post round?
- Do I have to convert my dataset from long to wide to estimate the ATT?

Moreover, the -attnd- command provides the standard error and a t-statistic. How can I see whether the ATT is significant (as, for example, shown but not explained in Khandker et al., 2010)?

Thank your very much for your help!



Lukas Borkowski
University of London, School of Oriental and African Studies (SOAS)


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