hw4.pdf - HW4(You dont need to hand in this homework 1 In R...

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HW4 (You don’t need to hand in this homework) 1. In R, “survdiff” under the R package “survival” can be used to perform the logrank test. Try the “survdiff” function to compare the survival distribution between D-penicillmain and placebo arms in pbc data, where “trt=1, 2” and “NA” representing D-penicillmain, placebo and not randomised, respectively. You also may use the command “plot” coupled with “survfit” to examine the differences in survival function graphically, e.g. survdiff(Surv(time, (status)>0)~trt, subset=(is.na(trt)==F),
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