topic Calculation of explained variation for cox model in Statistical Procedures

Calculation of explained variation for cox model

DavidsM — Thu, 01 Nov 2018 14:07:45 GMT

Hello community,

I am looking for ways to calculate explained variation for survival model of cox proportional Hazard regression. I request for assistance so that I can obtain (R2) for any of the common measures of variation except Schemper's R2.

I will be glad to receive assistance

Re: Calculation of explained variation for cox model

ballardw — Thu, 01 Nov 2018 22:10:22 GMT

Can you at least show some code of what you have attempted so we know which procedure you are attempting to use?

There are multiple procedures that might be used and without knowing which one you might be attempting it may be hard to suggest code changes.

Proc Phreg and Surveyphreg, which I am guessing you might be contemplating, have different limits and abilities.

Re: Calculation of explained variation for cox model

DavidsM — Sun, 04 Nov 2018 16:46:06 GMT

Am using Proc phreg like the code below.

Proc phreg data=Variation;
class Gender(ref='Male') INCOME(ref='HIGH'):
model Time * Status (0)= Gender INCOME / rl;
Selection=None details;
Output Out=Variations Survival=Survest;
run;

How can I obtain R2 if am using proc phreg?

I will be glad for your assistance.