vitcap data frame has 24 rows and 3 columns.
It contains data on vital capacity for workers in the cadmium industry.
It is a subset of the
vitcap2 data set.
This data frame contains the following columns:
a numeric vector; group codes are 1: exposed > 10 years, 3: not exposed.
a numeric vector, age in years.
a numeric vector, vital capacity (a measure of lung volume) in liters.
P. Armitage and G. Berry (1987), Statistical Methods in Medical Research, 2nd ed., Blackwell, p.286.
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