Student's Sleep Data

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

Description

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

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))