I am new to survival analysis and now trying to learn counting process input style. I am using the same dataset, but when using proc phreg, the couting process input and regular input is very different. Here is my first several lines in the dataset:
The regular one:
here is the code:
Proc phreg data=ds; class covar; model followup*event(0)=covar / entry=delay_entry; run;
proc phreg data=ds; class covar; model (start, end)*event(0)=covar; run;
Why the results are so different? Any idea would be appreciated. Thank you!