The Surv object contains the information on the type of censoring. Look at ?Surv for an explanation of how censored events are represented.
-Christos > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Lu, Jiang > Sent: Saturday, April 28, 2007 11:10 PM > To: r-help@stat.math.ethz.ch > Subject: [R] how to code the censor variable for "survfit" > > Dear r-helpers, > > This is my first time to run survival analysis. Currently, I > have a data set which contains two variables, the variable of > time to event (or time to censoring) and the variable of > censor indicator. For the indicator variable, it was coded as > 0 and 1. 0 represents right censor, 1 means event of > interest. Now I try to use "survfit" in the package of > "survival". I wrote the following code: > > rptsurv <- survfit(surv(time,censor)~1,data=x) > > Before I run the code, I am concerned with my 0/1 coding to > the censor indicator because I did not see any argument in > the syntax of "survfit", which may tell the program that > value 1 means event. I checked the documentations and R-help > archive, but ended in vain. > > Would you please kindly tell me how "survfit" treats censor variables? > In 0/1 coding, is it the default that 1 means event and 0 > means right censor? What if the censor was coded as 2 or 3 > instead of 0 or 1? I means how the "survfit" knows the > difference. In SAS, if a "lifetest" > procedure (similar to survfit) is performed, there is an > argument specifying which value in the censor variable is > treated as event. > > I know I could just compare the results from R and from SAS > to see the difference. However, I really want to know exactly > how "survfit" deals with this problem. Thank you very much in advance. > > sincerely, > > Jiang Lu > University of Pittsburgh > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.