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))