PHREG, different baseline survival

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Super Contributor
Posts: 297

PHREG, different baseline survival

Why do I have different survival estimate when I use this codes:

Both codes gives the same :Analysis of Maximum Likelihood Estimates.

Why are survival estimates different. I thought it will be the same


A)

data Pattern;

Age=0;

output;

run;

ods trace on /listing;

ods output ParameterEstimates=CPHH;

proc phreg data=new ;

model monset*obs(0)= age;

baseline covariates=Pattern out=survs survival= survival;

run;

ods trace off;


B)

where AgeD = Age- Overall Mean Age


data Pattern;

AgeD=0;

output;

run;

ods trace on /listing;

ods output ParameterEstimates=CPHH;

proc phreg data=new ;

model monset*obs(0)= ageD;

baseline covariates=Pattern out=survs survival= survival;

run;

ods trace off;

Super User
Posts: 17,963

Re: PHREG, different baseline survival

Are you saying the survival function is different or the survival estimates?

You're also requesting the baseline for different scenarios,

1) When age=0

2) when age=Mean age.

Super Contributor
Posts: 297

Re: PHREG, different baseline survival

different survival estimates

Super Contributor
Posts: 297

Re: PHREG, different baseline survival

Yes I am getting different survival estimates, I was expecting the same. Can anyone tell me what is wrong?

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