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As -h stcox- says: "fweights, iweights, and pweights may be specified using stset". BTW, what is -xi- in your command good for if there is no term to expand?
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected] [mailto:[email protected]] Im Auftrag von Michael Eisenberg
Gesendet: Freitag, 29. Mai 2009 07:23
An: [email protected]
Betreff: st: using frequency weights with stcox
Dear all,
I am attempting to perform an analysis bases on propensity scores.
After running psmatch2 which generates propensity scores and matches
cases and controls, I'd like to run a cox proportional hazards model.
The match works in such a way that some controls are counted more than
once for the final analysis. I would like to be able to incorporate
the weights into my cox model, but when I type
xi: stcox y1 x1 x2 x3 [fw=_weight]
I get the message
weights not allowed
A logistic model works without problems.
Are weights not allowed with the stcox command?
If not, are there any clever ways around this?
Thank you in advance.
Mike
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