## Pregnant Female Mice Experiment

### Description

Unpublished laboratory data on the proportion of affected foetuses in two groups (control and treatment) of 10
pregnant female mice (Kupper and Haseman, 1978, p. 75).

### Usage

`data(mice)`

### Format

A data frame with 20 observations on the following 3 variables.

- group
a factor with levels `CTRL`

and `TREAT`

- n
a numeric vector: the total number of foetuses.

- y
a numeric vector: the number of affected foetuses.

### References

Kupper, L.L., Haseman, J.K., 1978. *The use of a correlated binomial model for the analysis of a certain
toxicological experiments.* Biometrics 34, 69-76.