Weight gain of rats

Description

Data contains the weight gain for rats fed on four different diets: combinations of protein source (beef or cereal) and protein amount (low and high).

Format

A data frame with 40 observations on the following 3 variables.

1. Gain : a numeric vector
2. Protein : a factor with levels Beef Cereal
3. Amount : a factor with levels High Low

Source

Hand et al. (1993). A Handbook of Small Data Sets. Chapman and Hall