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Re: st: Manually compute IPTW for PS matching?


From   Austin Nichols <[email protected]>
To   [email protected]
Subject   Re: st: Manually compute IPTW for PS matching?
Date   Fri, 16 Mar 2012 11:03:13 -0400

Pete "TA Stat" <[email protected]>:
Some authors prefer a rescaled weight; see also
http://www.stata-journal.com/sjpdf.html?articlenum=st0136_1
http://www.stata-journal.com/sjpdf.html?articlenum=st0136

On Fri, Mar 16, 2012 at 10:51 AM, Adam Olszewski
<[email protected]> wrote:
> 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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