| InsectSprays {base} | R Documentation |
The counts of insects in agricultural experimental units treated with different insecticides.
data(InsectSprays)
A data frame with 72 observations on 2 variables.
| [,1] | count | numeric | Insect count |
| [,2] | spray | factor | The type of spray |
Geoffrey Beall, (1942). ``The Transformation of Data from Entomological Field Experiments'', Biometrika, pages 243-262.
McNeil, D. (1977). Interactive Data Analysis. New York: Wiley.
data(InsectSprays)
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)