budworm {evidence}

Mortality data of moth larvae due to increasing doses of insecticide.

Description

Batches of twenty larvae were exposed to increasing doses of insecticide, and the number of survivors and their sexes were noted. These data were reported by Collett(1991) and used by Venables and Ripley(1994 and later editions). They resulted from an experiment to study the toxicity of a pyrethroid insecticide to the tobacco budworm Heliothis virescens of different doses of the insecticide.

Usage

data(budworm)

Format

A data frame with 12 observations on the following 3 variables:

ldose

the log of the dose of the insecticide

dead

the number of budworms that were dead a day later

sex

a factor with two levels: “F” and “M”

Source

Collett, D. 1991. Modelling Binary Data. Chapman and Hall, London.

References

van Hulst, R. 2018. Evaluating Scientific Evidence. ms.

Venables, W.N. and Ripley, B.D. 1994. Modern Applied Statistics with S-PLUS. Springer Verlag, New York.

Examples

data(budworm)
fit <- glm(cbind(dead, 20 - dead) ~ ldose, data=budworm,
family=binomial)
summary(fit)