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Re: st: Manually compute IPTW for PS matching?
From
Adam Olszewski <[email protected]>
To
[email protected]
Subject
Re: st: Manually compute IPTW for PS matching?
Date
Fri, 16 Mar 2012 10:51:25 -0400
Hi Pete,
Are you doing PS matching or weighting? If you're only doing 1:1
matching then IPTW is not necessary.
I usually calculate IPTW manually:
gen iptw = treatment/pscore + (1-treatment)/(1-pscore)
I am not aware of any "step-by-step" Stata-specific tutorial on PS
matching. It is a complex process if to be done properly, with
appropriate diagnostics and many potential pitfalls. One brief general
intro is at:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3144483/
Also, read the help for -pscore2- -pstest- -psgraph- and -pbalchk- thoroughly.
Adam Olszewski
On Fri, Mar 16, 2012 at 2:03 AM, TA Stat <[email protected]> wrote:
> Dear All
>
> This is a simple question. After run psmatch2 command (1:1 matching),
> I got pscore, treated, support, weight, n1, nn, pdif variables. Do I
> have to manually calculate IPTW? Is any recommended step-by-step
> illustration of PS matching in Stata available?
>
> Thanks
> Pete
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