Insecticides

Description

The number of insects killed at various doses of insecticide

Usage

data(deposit)

Format

A data frame with 18 observations on the following 4 variables.

Killed

the number of insects killed at each poison level; a numeric vector

Number

the number of insects exposed at each poison level; a numeric vector

Insecticide

the insecticide used; a factor with levels A, B and C

Deposit

the amount of deposit (insecticide) used in milligrams; a numeric vector

Details

Fifty insects were exposed to various deposits of insecticides. The proportions of the insects killed after six days exposure were recorded.

Source

P. S. Hewlett and T. J. Plackett (1950) Statistical aspects of the independent joint action of poisons, particularly insecticides. II. Examination of data for agreement with hypothesis. Annals of Applied Biology, 37, 527–552.

References

Wotjek J. Krzanowski (1998) An Introduction to Statistical Modelling, Arnold: London.

Examples

data(deposit)
summary(deposit)