Re: st: examples propensity score matching

[Michael McCulloch <mm@pinest.org>]

Dear Gaby,
You should have the main treatment variable as categorical, and your 
other covariates can be either categorical or continuous. The 
following paper provides a good overview of the -pscore- Stata ado 
program, and was written by the author of -pscore-:
Becker, S. O. and A. Ichino (2002). "Estimation of average treatment 
effects based on propensity scores." The Stata Journal 2(4): 358-77.
Hope this helps,
Michael


> Dear Stata users,
>
> A very basic question. I want to take a look at how to do a 
> propensity score matching in stata (commands psmatch2, pscore, I 
> think).
> I have two cross sectional surveys (t1, t2)  where I observe 
> treatment and control individuals in the second period but I cant 
> know the conterfactual in t1. I want to use propensity score 
> matching to indivudals in t2 to individuals in t1 based on some 
> observable characteristics.
> I have technical readings and literature but I would like to know 
> the how to in Stata. how the data should look? should I pool 
> individuals for both cross-sections? 
>
> thanks,
> Gaby
>
>
>      
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