- 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).
- A data frame with 40 observations on the following 3 variables.
- Gain : a numeric vector
- Protein : a factor with levels Beef Cereal
- Amount : a factor with levels High Low
- Hand et al. (1993). A Handbook of Small Data Sets. Chapman and Hall
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