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st: Using -stpm2- for Mean, Median Survival Times with CIs for subgroups


From   graupel75@gmail.com
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Using -stpm2- for Mean, Median Survival Times with CIs for subgroups
Date   Tue, 15 May 2012 11:00:06 +0800

Dear statalisters,

Building on earlier threads, I would like to get mean and median
survival times (with CIs) for three exposure groups from a flex
parametric survival model (-stdp2-, aka "Royston-Paramar" models),
setting some co-variate categories to baseline levels. I've consulted
Royston and Lambert's 2011 Stata book, the SJ articles for -stpm- and
-stpm2- along with a range of pdfs from Royston and others.

The main issue is: -predict rmst- and -predict median- give a value
for each individual, and not the (sub)-population values. Should these
be evaluated with -at- options for baselines of the covariates, and
then summarized for each of the exposure categories? I am not
convinced this a valid approach.

Any clarification or suggestions would be greatly appreciated.

cheers-
Andrew
______________________________________________
Epidemiologist
Centre for Infectious Disease Epidemiology Research (CIDER)
Saw Swee Hock School of Public Health
National University of Singapore
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