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Laboratory study of survival for two groups of mice exposed to radiation.
mice
A data frame with 181 rows and 3 variables:
environment
integer type of environment (1=standard, 2=germ-free)
causeofdeath
integer cause of death (1=thymic lymphoma, 2=reticulum cell sarcoma, 3=other causes)
time
integer survival time (days)
See Collett (2023). Note that are no censored event times.