Vampire Bat Bites
Numbers of cattle bitten by the cow's estrous cycle.
A data frame with 4 observations on the following 3 variables.
a factor with levels: no
and
yes
a factor with levels: no
and
yes
a numeric vector
Turner, D.C. 1975. The Vampire Bat: a Field Study in Behavior and Ecology. Johns Hopkins Press: Baltimore, MD.
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