Habitat Preferences of Lizards

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Description

The lizards data frame has 23 rows and 6 columns. Variables grahami and opalinus are counts of two lizard species at two different perch heights, two different perch diameters, in sun and in shade, at three times of day.

Usage

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Format

This data frame contains the following columns:

grahami

count of grahami lizards

opalinus

count of opalinus lizards

height

a factor with levels "<5ft", ">=5ft"

diameter

a factor with levels "<=2in", ">2in"

light

a factor with levels "sunny", "shady"

time

a factor with levels "early", "midday", "late"

Source

McCullagh, P. and Nelder, J. A. (1989) Generalized Linear Models (2nd Edition). London: Chapman and Hall.

Originally from

Schoener, T. W. (1970) Nonsynchronous spatial overlap of lizards in patchy habitats. Ecology 51, 408–418.

Examples

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data(lizards)
glm(cbind(grahami, opalinus) ~ height + diameter + light + time,
    family = binomial, data=lizards)
brglm(cbind(grahami, opalinus) ~ height + diameter + light + time,
    family = binomial, data=lizards)