baseline survival function in the cox model with covariates set to zero ie age3=0

[desireatem]

Hi the code below gives the s_(t)=[s_(0)]^esp(beta *Av(age3)).

How do I modify the code to get the baseline survival at age3=0, that is just s_(0).

Below is the code that need to be fixed

ods trace on /listing;

ods output ParameterEstimates=CPHH;

proc phreg data=new ;

model monset*obs(0)= age3;

baseline out=survs survival= survival;

run;

ods trace off;

[desireatem · Accepted solution]

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;