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What was the incidence rate for tumors

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Reference no: EM132113606

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.

  1. How many rats had tumors? What was the total rat-time contributed by all the animals? What was the incidence rate for tumors?
  2. Calculate a Wald 95% confidence interval for the true incidence rate λ

(which is also the exponential rate parameter and hazard).

Reference no: EM132113606

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