rats contains measurement data of time survival of a sample of rats
to which was administered three types of poison and four types of treatment. Each
combination poison-treatment is administered to four rats.
rats is a tbl data frame with 48 observations on 3 variables.
The 3 variables of the
rats tbl data frame are the following ones:
Time survival time (hours) (numeric)
Poison poison type (factor with levels:
Treatment type of treatment (factor with levels:
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