lizards R Documentation

## A Comparison of Site Preferences of Two Species of Lizard

### Description

“These data describe the daytime habits of two species of lizards, grahami and opalinus. They were collected by observing occupied sites or perches and recording the appropriate description, namely species involved, time of the day, height and diameter of the perch and whether the site was sunny or shaded. Time of the day is recorded as early, mid-day or late.” (McCullagh and Nelder, 1989, p.129).

### Usage

data(lizards)

### Format

A data frame with 24 observations on the following 6 variables.

Site

A factor with levels Sun and Shade.

Diameter

A factor with levels D <= 2 and D > 2 (inches).

Height

A factor with levels H < 5 and H >= 5 (feet).

Time

A factor with levels Early, Mid-day and Late.

grahami

A numeric vector giving the observed sample size for grahami lizards.

opalinus

A numeric vector giving the observed sample size for opalinus lizards.

### Details

The data were originally published in Fienberg (1970).

### Source

McCullagh, P., Nelder, J.A., 1989. Generalized linear models. London, Chapman & Hall, 511 p.

### References

Fienberg, S.E., 1970. The analysis of multidimensional contingency tables. Ecology 51: 419-433.

### Examples

data(lizards)