budworm {evidence} | R Documentation |
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.
data(budworm)
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”
Collett, D. 1991. Modelling Binary Data. Chapman and Hall, London.
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.
data(budworm)
fit <- glm(cbind(dead, 20 - dead) ~ ldose, data=budworm,
family=binomial)
summary(fit)