Question: PLEASE USE R PROGRAMING Rat data from KMsurv package contains data on time to tumor development for some litters of rats treated with drug or

PLEASE USE R PROGRAMING

Rat data from KMsurv package contains data on time to tumor development for some litters of rats treated with drug or placebo. Test the hypothesis that there is no difference in the times to tumor between the treated and control rats using a log-rank statistic stratified on litter.

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