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st: RE: RE: Checking goodness of fit of stcox when using the tvc() option
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"Simmons, Nicole" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: RE: RE: Checking goodness of fit of stcox when using the tvc() option
Date
Fri, 19 Jul 2013 01:11:20 -0400
Thank you Andrew--So predict xb and stcoxkm the predictions and overlay the two graphs? That would be fine if I could figure out the syntax--Nicole
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: Thursday, July 18, 2013 11:12 PM
To: Statalist
Subject: st: RE: Checking goodness of fit of stcox when using the tvc() option
Hello Nicole,
Easiest might be to do visual check with the predictions overlaid onto the Kaplan-Meir Curves; crude, but should show any large-scale deviations.
Also, check into Harrell's c and Somer's D statistics using -somersd- (SSC); not sure about -tvc- here though.
Newson RB. Comparing the predictive power of survival models using Harrell's c or Somers' D. The Stata Journal 2010; 10(3): 339-358.
The other option is to use -stpm2- (SSC) to fit Royston-Parmar parametric survival models; a little time to get into, but allow for much greater options in dealing with tvc effects.
cheers-
Andrew Lover
___________________________________________________________
Epidemiologist
Centre for Infectious Disease Epidemiology Research (CIDER) Saw Swee Hock School of Public Health National University of Singapore
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