InsectSprays

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Embed
<iframe src="https://embed.picostat.com/insectsprays.html" frameBorder="0" width="100%" height="307px" />
Attachment Size
dataset-41513.csv 482 bytes
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Documentation

Effectiveness of Insect Sprays

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)
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