(Answered) The rats data set in the survival package in r can be

Economics

The rats data set in the survival package in R can be loaded by typing "data(rats)". It contains data on 300 rats-3 selected from each of 100 litters-that were followed for tumor incidence. The variable time is the follow-up times and the variable status is the event indicator.

How many rats had tumors? What was the total rat-time contributed by all the animals? What was the incidence rate for tumors?
Calculate a Wald 95% confidence interval for the true incidence rate λ (which is also the exponential rate parameter and hazard).

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