Log Rank (Varying the Rho) in SAS

[ChuksManuel]

Hello,

Please i am a user of  R and i want to know how this problem can be tackled in SAS.

 I've been working on this R code and tried to replicate it in SAS.

survdiff(formula=Surv(time,status)~Tx, data=leuk, rho=0).

I know sas has a code where you request for the logrank test, but i want to be able to change my "rho". I can do that in R relatively easily and i want to know if there's a way it could be done in SAS.

A typical program for the log rank test in SAS is this:

proc lifetest method=km plots=(s) data=bmtZ10eq1;
strata grp / test= logrank;
time T2*d3(0) ;

 Two question i have is: What rho was used in the SAS program and is it possible to vary my value of rho in SAS?

For example,  in R, rho=0: chi Squre=16.8; P value=0.0000417 and when i changed my rho =1, Chisqure=14.5; P value= 0.000143

Thanks

[art297]

Not an area I'm familiar with, but doesn't Rho in R simply control the type of test used (i.e., with 0=logrank and 1=peto)?

If so, you're already controlling it with the test option.

Art, CEO, AnalystFinder.com