budworm {GLMsData}

Insecticide doses and tobacco budworm

Description

The number of tobacco budworms dying at various doses of pyrethroid

Usage

data(budworm)

Format

A data frame with 12 observations on the following 4 variables.

Killed

the number of budworms killed at each dose; a numeric vector

Number

the number of budworms exposed at each dose; a numeric vector

Dose

the dose of pyrethroid trans-cypermethrin in micrograms; a numeric vector

Gender

the gender of the budworms; a factor with levels F (female) and M (male)

Details

The data concern the tobacco budworm Heliothis virescens and the doses of pyrethroid trans-cypermethrin (to which the moths were beginning to show resistance). Twenty male and twenty female moths were exposed at each of six doses of the pyrethroid, and the number that were killed recorded.

Source

W. N. Venables and B. D. Ripley (1997). Modern Applied Statistics with S-Plus, second edition. Springer-Verlag: New York (p 230)

D. Collett (1991). Modelling Binary Data. Chapman and Hall: London.

Examples

data(budworm)
summary(budworm)