R: Habitat Preferences of Lizards

lizards {brglm} | R Documentation

## Habitat Preferences of Lizards

### 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

    data(lizards)

### 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

    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)

[Package brglm version 0.5-9 Index]