rats {evidence}

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)

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

Source

Gail, M.H., Santner, T.J., and Brown, C.C. (1980) An analysis of comparative carcinogenesis experiments based on multiple times to tumor. Biometrics 36, 255–266.

References

van Hulst, R. 2018. Evaluating Scientific Evidence. ms.