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Re: st: propensity score problem


From   brendan.halpin@ul.ie (Brendan Halpin)
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: propensity score problem
Date   Fri, 16 Mar 2012 13:12:30 +0000

On Fri, Mar 16 2012, Nick Cox wrote:
> From: CARLOS MAGNO SANTOS CLEMENTE [mailto:carlosmagno_sc@ig.com.br] 
> Estimation of the propensity score
>
> outcome does not vary, remember:
>                                    0 = negative outcome,
>          All Other nonmissing values = positive outcome
> r (2000);

The unnamed propensity score program is probably failing to fit a probit
or logit on the propensity to be treated, where the dependent variable
is the treatment. This variable must be 0/non-zero; the error is the
usual one seen when logit or probit is fed a dependent which doesn't
have zero values.

Generate a treatement variable that is 1 if treated and zero otherwise.

Brendan
-- 
Brendan Halpin,   Department of Sociology,   University of Limerick,   Ireland
Tel: w +353-61-213147  f +353-61-202569  h +353-61-338562;  Room F1-009 x 3147
mailto:brendan.halpin@ul.ie    ULSociology on Facebook: http://on.fb.me/fjIK9t
http://teaching.sociology.ul.ie/bhalpin/wordpress         twitter:@ULSociology

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