A data frame with 173 observations on 6 variables.
Individuals (rows of the data frame) are female horseshoe crabs.
Variables other than satell
refer to these females.
The variables are
- color
color. The colors given in
Agresti are “light medium”, “medium”, “dark medium”,
and “dark”. Here they are abbreviated to light
,
medium
, dark
, and darker
, respectively.
- spine
spine condition. The conditions given in Agresti are
“both good”, “one worn or broken”, and
“both worn or broken”.
Here they are abbreviated to good
, middle
, bad
,
respectively.
- width
carapace width in centimeters
- satell
number of satellites, which males clustering around the
female in addition to the male with which she is breeding.
- weight
weight in grams.
- y
shorthand for as.numeric(satell > 0)
.