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Re: st: Propensity score matching: confidence intervals


From   Nyasha Tirivayi <ntirivayi@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Propensity score matching: confidence intervals
Date   Tue, 26 Jul 2011 21:40:50 +0200

Thanks Ariel

Last time I checked it was not possible to add robust option in the
logit regression. When I add the bootstrap option, I get confidence
ntervals and a  z-stat. Yet I thought the t-stat was the important
indicator of significance. So  which one should I take? If I choose
the t-stat are you recommending manual calculation?

Kindly advise

N.Tirivayi
Post-doc fellow
Maastricht University
Netherlands

On Tue, Jul 26, 2011 at 6:50 PM, Ariel Linden. DrPH
<ariel.linden@gmail.com> wrote:
> As PSMATCH2 uses regression to derive those estimates, you can do the same
> manually. In fact, I'd suggest you add robust or cluster SE's (cluster on
> pair ID). PSMATCH2 creates all the variables you'll need to run the
> regression.
>
> Ariel
>
> Date: Mon, 25 Jul 2011 23:22:34 +0200
> From: Nyasha Tirivayi <ntirivayi@gmail.com>
> Subject: st: Propensity score matching: confidence intervals
>
> Dear All
>
> I would like to ask for your advice on the psmatch2 software.
>
> I am using psmatch2 to determine program impact. I am using the kernel
> and nearest neighbour estimators. Kindly advise on the following:
>
> 1. To report significance of ATT which test statistic should I use,
> the one labelled T-stat or the z-statistic after bootstrapping?
> 2. If I use the T-stat, is there a way of obtaining confidence
> intervals? I need to report the confidence intervals and p-valuesl for
> a medical journal.
>
> Kindly advise
>
> N. Tirivayi
> Post-doc Fellow
> Maastricht University
> Netherlands
>
>
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