Students' Sleep Data

Description

Data which show the effect of two soporific drugs (increase in hours of sleep) on groups consisting of 10 patients each.

Usage

data(sleep)

Format

A data frame with 20 observations on 2 variables.

[, 1]	extra	numeric	increase in hours of sleep
[, 2]	group	factor	patient group

Source

Student (1908) The probable error of the mean. Biometrika, 6, 20.

References

Scheffé, Henry (1959) The Analysis of Variance. New York, NY: Wiley.

Examples

data(sleep)
## ANOVA
anova(lm(extra ~ group, data = sleep))