rats: Carcinogenesis data on rats exposed to a carcinogen.
Description
Up to forty eight rats were exposed to the carcinogen retinyl acetate
or to a placebo in their diet, after which the number of tumors they developed
was evaluated.
Usage
data(rats)
Arguments
Format
A data frame with 71 observations on the following 2 variables:
y
number of rats that developed tumors
N
number of rats in group
References
van Hulst, R. 2018. Evaluating Scientific Evidence. ms.