Values from a study reported in the American Journal of Clinical Nutrition that investigated a new method for measuring body composition
A data frame with 18 observations on the following 3 variables:
age in years
body fat composition
a factor with levels F
for female and M
for male
Mazess, R. B., Peppler, W. W., and Gibbons, M. (1984) Total Body Composition by Dual-Photon (153 Gd) Absorptiometry. American Journal of Clinical Nutrition, 40, 4: 834-839.
Ugarte, M. D., Militino, A. F., and Arnholt, A. T. (2008) Probability and Statistics with R. Chapman & Hall/CRC.
boxplot(fat ~ sex, data = Bodyfat)