R: Effectiveness of Insect Sprays

InsectSprays {datasets} | R Documentation

## 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
[,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

    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)

[Package datasets version 2.8.1 Index]