Description

This data set consists of counts of anuran larvae as a function of pond type, pond perimeter, and presence of water scorpions (Ranatra sp.).

Usage

Format

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

Type

pond type, denotes the location of ponds in either bog or upland environment

Num_anura

number of anuran larvae in minnow traps

Effort

number of trap nights (i.e., number of traps x days of trapping) in each pond

Perimeter

pond perimeter in meters

Num_ranatra

number of water scorpions trapped in minnow traps

log.Perimeter

natural log of perimeter

Details

Mazerolle (2006) uses this data set to illustrate model selection for Poisson regression with low overdispersion.

Source

Mazerolle, M. J. (2006) Improving data analysis in herpetology: using Akaike's Information Criterion (AIC) to assess the strength of biological hypotheses. Amphibia-Reptilia 27, 169–180.

Examples