search for: trythi

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2008 Dec 04
1
comparing SAS and R survival analysis with time-dependent covariates
...fferent. This seems to happen when there are ties in the events/covariates times. My question is what software, R or SAS, is more reliable for the survival analysis with time-dependent covariates or if you could point out a problem in the following example. Example. SAS gives HR=3.236: data trythis; input id days timedeli stat; datalines; 1 3 .5 1 2 1.5 1 1 3 6 1000 0 4 8 1000 1 5 8 1 0 6 21 1000 1 7 11 3 1 run; proc phreg data=trythis; model days*stat(0)=deli/risklimits ties=exa...
2009 Aug 03
3
session logging
Consider all the text that one sees on the console during an R session. Is there a way, within R, to make all this text--both the "output" and the "messages"--automatically get copied to a single text file, in addition to seeing it on the console? If I remember to save the console to a file at the end of my R session, that does it. But (1) That requires pointing and