datasets (version 3.5.1)

InsectSprays: Effectiveness of Insect Sprays

Description

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

Usage

InsectSprays

Format

A data frame with 72 observations on 2 variables.

[,1]

count

numeric

Insect count

References

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

Examples

# NOT RUN {
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)
# }