The
cabbages data set has 60 observations and 4 variables
This data frame contains the following columns:
c39 and
c52.
d16,
d20 or
d21.
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.)