The cabbages data set has 60 observations and 4 variables
Usage
cabbages
Format
This data frame contains the following columns:
Cult
Factor giving the cultivar of the cabbage, two levels: c39
and c52.
Date
Factor specifying one of three planting dates: d16,
d20 or d21.
HeadWt
Weight of the cabbage head, presumably in kg.
VitC
Ascorbic acid content, in undefined units.
Source
Rawlings, J. O. (1988)
Applied Regression Analysis: A Research Tool.
Wadsworth and Brooks/Cole. Example 8.4, page 219.
(Rawlings cites the original source as the files of the late
Dr Gertrude M Cox.)
References
Venables, W. N. and Ripley, B. D. (1999)
Modern Applied Statistics with S-PLUS. Third
Edition. Springer.