I need to show a fit of the baseline survival function of a weibull and a cox regression
But i have no idea how to do this and which statistic to take

Program:

proc phreg data=burn;
model timestraphyday*straphy(0)=treatment respitatory gender race percentage head buttocks trunk upperleg lowerleg;
run;

proc lifereg data=burn;
model timestraphyday*straphy(0)= treatment gender race percentage head buttocks trunk upperleg respitatory lowerleg;
run;