InsectSprays {datasets} | R Documentation |
The counts of insects in agricultural experimental units treated with different insecticides.
InsectSprays
A data frame with 72 observations on 2 variables.
[,1] | count | numeric | Insect count |
[,2] | spray | factor | The type of spray |
Beall, G., (1942) The Transformation of data from entomological field experiments, Biometrika, 29, 243–262.
McNeil, D. (1977) Interactive Data Analysis. New York: Wiley.
require(stats) 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)