datasets (version 3.3)

InsectSprays: Effectiveness of Insect Sprays

Description

The counts of insects in agricultural experimental units treated with different insecticides.

Usage

InsectSprays

Arguments

format

A data frame with 72 observations on 2 variables. rlll{ [,1] count numeric Insect count [,2] spray factor The type of spray }

source

Beall, G., (1942) The Transformation of data from entomological field experiments, Biometrika, 29, 243--262.

References

McNeil, D. (1977) Interactive Data Analysis. New York: Wiley.

Examples

Run this code
require(stats); require(graphics)
boxplot(count ~ spray, data = InsectSprays,
        xlab = "Type of spray", ylab = "Insect count",
        main = "InsectSprays data", varwidth = TRUE, col = "lightgray")
fm1 <- aov(count ~ spray, data = InsectSprays)
summary(fm1)
opar <- par(mfrow = c(2, 2), oma = c(0, 0, 1.1, 0))
plot(fm1)
fm2 <- aov(sqrt(count) ~ spray, data = InsectSprays)
summary(fm2)
plot(fm2)
par(opar)

Run the code above in your browser using DataCamp Workspace