change the scale of x axis of survival curve

tan-wongv — Wed, 15 May 2024 06:17:05 GMT

I ran the following code and got the curve below.

proc lifetest data=sasuser.combine_aim2n2 plots=survival(f) timelist=(0 to 132 by 12);
time month2*ui2(0);
run;

Would there be a way to change the scale of x axis from 0 25 50 75 100 125 to 0 12 24 36 48 60 72 84 96 108 120 132?

Re: change the scale of x axis of survival curve

FreelanceReinh — Wed, 15 May 2024 10:41:22 GMT

@tan-wongv wrote:

Would there be a way to change the scale of x axis from 0 25 50 75 100 125 to 0 12 24 36 48 60 72 84 96 108 120 132?

Yes, I see three ways to do this, the simplest of which is a combination of three survival (plot) options:

Specify those tick marks in the ATRISK option.
Add the ATRISKTICKONLY option.
Make the "At Risk" display invisible by using a tiny proportion in the OUTSIDE option.

proc lifetest data=sasuser.combine_aim2n2 plots=survival(f atrisk(outside(1e-6))=0 to 132 by 12 atrisktickonly);
time month2*ui2(0);
run;

It is possible, though, that the last tick mark (132) is not displayed if the greatest failure time is less than 132.

The other two ways are more cumbersome:

Write the data needed for the plot to a dataset (by using the OUTSURV= option of the PROC LIFETEST statement and a subsequent DATA step) and then use PROC SGPLOT to create the plot where you have the XAXIS statement and its various options available.
Modify a copy of the ODS template underlying the plot, which is Stat.Lifetest.Graphics.ProductLimitFailure. Change the first occurrence of
```
linearopts=(viewmax=MAXTIME tickvaluelist=XTICKVALS ...
```
in the PROC TEMPLATE code to
```
linearopts=(viewmax=132 tickvaluelist=(0 12 24 36 48 60 72 84 96 108 120 132) ...
```

tan-wongv — Wed, 15 May 2024 21:52:00 GMT

Thank you very much for your help!