The data come from an experiment to study the gain in weight of rats fed on four different diets, distinguished by amount of protein (low and high) and by source of protein (beef and cereal).
A data frame with 40 observations on the following 3 variables:
proteinsource (a factor with levels
proteinamount (a factor with levels
weightgain (weight gained in grams)
The design of the experiment is a completely randomized design with ten rats in each of the four treatments.
Hand, D. J., F. Daly, A. D. Lunn, K. J. McConway, and E. Ostrowski. 1994. A Handbook of Small Datasets. Chapman and Hall/CRC, London.
Ugarte, M. D., Militino, A. F., and Arnholt, A. T. 2015. Probability and Statistics with R, Second Edition. London: Chapman & Hall.
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Loading required package: lattice Loading required package: ggplot2 Call: aov(formula = weightgain ~ proteinsource * proteinamount, data = WEIGHTGAIN) Terms: proteinsource proteinamount proteinsource:proteinamount Sum of Squares 220.9 1299.6 883.6 Deg. of Freedom 1 1 1 Residuals Sum of Squares 8049.4 Deg. of Freedom 36 Residual standard error: 14.95307 Estimated effects may be unbalanced
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