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Re: st: Paired t-test for propensity match cohort


From   Lars Folkestad <lfolkestad@health.sdu.dk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Paired t-test for propensity match cohort
Date   Sun, 17 Jul 2011 18:06:54 +0200

If you sort group and age and use the stable option you can reshape your data using the reshape wide option
The stable option is critical. 
Tjeck you data one million times when you have reshaped your data, so that pair 1 is a line. (there is a funktion in Stata that can do the checking for you, but cannot remember the name of it.)

Then do ttest varex1 == varex2

Hope it helps, and that i havent misunderstood your problem.

Mvh
Lars Folkestad


Den 17/07/2011 kl. 17.26 skrev "Sripal Kumar" <sripalkumar@gmail.com>:

> Dear all,
> 
> There should be a simple solution to the problem below but I cant seem
> to wrap my head around it. I have a propensity matched cohort that is
> arranged as
> 
> Pairs               matching_Variable              Age
> 1                           0                                    53
> 1                           1                                    54
> 2                           0                                    55
> 2                           1                                    52
> 3                           0                                    55
> 3                           1                                    52
> 4                           0                                    53
> 4                           1                                    54
> 5                           0                                    55
> 5                           1                                    52
> 
> How can I do a paired sample t-test for age without having to create
> two other variables age_0 and age_1.
> thanks in advance.
> Sripal.
> 
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