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Re: st: stcox after psmatch2

From   Steve Samuels <>
Subject   Re: st: stcox after psmatch2
Date   Thu, 10 May 2012 07:28:35 -0400

You can designate pairs as strata in -stcox- (Kalbfleisch & Prentice, 2002, p. 329).
But that will not provide information about the survival curve. 
An alternative (Ho et al. (2007)) is to ignore the pairing.


Ho, D. E., Imai, K., King, G., & Stuart, E. A. (2007). Matching as Nonparametric
Preprocessing for Reducing Model Dependence in Parametric Causal Inference. 
Political Analysis, 15(3), 199-236. 


Kalbfleisch, J. D., & Prentice, R. L. (2002). The statistical analysis of failure time
data (2nd ed. Vol. Wiley series in probability and statistics). Hoboken, N.J: Wiley

On May 10, 2012, at 1:33 AM, George Gunapal Pradeep Paul (NHGHQ) wrote:

Dear all,
I am comparing a group of Chronic Obstructive Pulmonary Disease (COPD)patients enrolled in a disease management program and a control group. I calculated pscore and did psmatch2 using c:\ado\plus\p\psmatch2.ado *! version 4.0.5 18apr2012 E. Leuven, B. Sianesi. I used psmatch2 to adjust for their baseline differences and now I would like to do a cox regression on the matched program patients and controls to see if there is a difference in time to death between the two groups.

I would like to know how to run stcox after psmatch2 , thereby identifying the matching sequence for the cox regression. I tried looking for answers for this but found only one unanswered relevant question which could be found at

Kindly help.

Thank you,

Best regards,


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