These data are from a randomized experiment to asses the effect of large doses of vitamin C on the incidence of colds.
A data frame with 4 observations on the following 4 variables.
the daily dose of vitamin C, in g
the number of subjects given that dose of vitamin C
the number of subjects who did not become ill
the proportion of subjects who did not become ill
Ramsey, F.L. and Schafer, D.W. (2013). The Statistical Sleuth: A Course in Methods of Data Analysis (3rd ed), Cengage Learning.
Anderson, T.W., Suranyi,G., and Beaton, G.H. (1974) The Effect on Winter Illness of Large Doses of Vitamin C Canadian Medical Association Journal 111 31–36.