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st: RE: survival analysis with strata and PSU

From   "Sayer, Bryan" <>
To   "'Sarah A. Mustillo '" <>, "' '" <>
Subject   st: RE: survival analysis with strata and PSU
Date   Mon, 25 Nov 2002 17:13:09 -0500

Stata does not have survey versions of survival models.  SUDAAN version 8
does.  Or in Stata you can specify PSU as the cluster, along with weights
and ignore the stratification.  This will yield conservative results with
larger than necessary variances.  Which might be sufficient, depending on
the amount of stratification in the data.

Bryan Sayer
Statistician, SSS Inc.

-----Original Message-----
From: Sarah A. Mustillo
Sent: 11/25/02 11:33 AM
Subject: st: survival analysis with strata and PSU

Hi -

I would like to run a cox model on survey data that has PSU, strata and 
pweights.  I need to model time to death (continuous) using depressive 
symptoms as an independent variable.  -stcox- will allow the weights,
not psu or strata.  There is no cox command in the -svy- suite.   Can
cox model be adjusted for sampling design, or is there an alternative 
analytic approach?



Sarah A. Mustillo, Ph.D
Center for Developmental Epidemiology
Department of Psychiatry and Behavioral Sciences
Duke University School of Medicine
Box 3454
Durham NC 27710

919 687-4686 x234

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