Skip to Content
Home » Language reference » sleep {datasets}

sleep {datasets}

Student's Sleep Data
Package: 
datasets
Version: 
R 3.0.1

Description

Data which show the effect of two soporific drugs (increase in hours of sleep compared to control) on 10 patients.

Usage

sleep

Details

The group variable name may be misleading about the data: They represent measurements on 10 persons, not in groups.

References

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

Examples

require(stats)
## Student's paired t-test
with(sleep,
     t.test(extra[group == 1],
            extra[group == 2], paired = TRUE))
 
## The sleep *prolongations*
sleep1 <- with(sleep, extra[group == 2] - extra[group == 1])
summary(sleep1)
stripchart(sleep1, method = "stack", xlab = "hours",
           main = "Sleep prolongation (n = 10)")
boxplot(sleep1, horizontal = TRUE, add = TRUE,
        at = .6, pars = list(boxwex = 0.5, staplewex = 0.25))

Documentation reproduced from R 3.0.1. License: GPL-2.