Im running a survival analysis and I have a variable 'age' where the data ranges from 30-90 years old but how do I cut it off and make it so the survival probability graph will only include up to the age of 60? Also how might I group them in categories of say 30-50 years, 50-70 years, and 70-90 years?   proc lifetest data=lungcancer plots=survival(atrisk); time survival*status(0); strata age / test=logrank; run;   ... View more