PROC ICLIFETEST time intervals are different

Minyoungkim90 — Thu, 15 Dec 2022 21:14:03 GMT

Hello. I am working on some project to compare the mortality.

I have follow up data for 3/6/9/12 months.

However, I do not know the exact time when they are dead, so I though interval-censoring should be used.

For example, the data that I organized looks like this. So if the person died between the start and 3 months, ltime=0, rtime=3.

I read the documentation that introduces the PROC ICLIFETEST and tried it but I keep getting weird time intervals.

My time intervals should be 0-3 3-6 6-9 9-12 12-inf but I get 3-3 6-6 9-9 12-12

My SAS code is

proc iclifetest data=acs.data3 impute(seed=1234);
time (lTime, rTime);
strata indi;
run;

Can anyone help me what is wrong with this?

And also, is there any way that I can modify the plots for PROC ICLIFETEST?

I used the macro for KM plots for PROC LIFETEST but can't find a way to modify this plot (range for x and y axis)

Thank you

topic PROC ICLIFETEST time intervals are different in Statistical Procedures