glmbb (version 0.1)

crabs: Horseshoe Crab Mating Data

Description

Data on horseshoe crabs (Limulus polyphemus). Response is number of males surrounding a breeding female, color (factor), condition (factor), weight (quantitative), and width (quantitative) of the female.

Usage

crabs

source

Agresti, A. (2013) Categorical Data Analysis, Wiley, Hoboken, NJ., Section 4.3.2, http://www.stat.ufl.edu/~aa/cda/data.html

Brockmann, H. J. (1996) Satellite Male Groups in Horseshoe Crabs, Limulus polyphemus, Ethology, 102, 1--21.

Details

Quoting from the abstract of Brockmann (1996). Horseshoe crabs arrive on the beach in pairs and spawn ...during ...high tides. Unattached males also come to the beach, crowd around the nesting couples and compete with attached males for fertilizations. Satellite males form large groups around some couples while ignoring others, resulting in a nonrandom distribution that cannot be explained by local environmental conditions or habitat selection.

Examples

data(crabs)
  gout <- glm(satell ~ color + spine + width + weight, family = poisson,
      data = crabs)