sleep

Student's Sleep Data

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

Keywords
datasets
Usage
sleep
Details

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

Format

A data frame with 20 observations on 3 variables.

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

Source

Cushny, A. R. and Peebles, A. R. (1905) The action of optical isomers: II hyoscines. The Journal of Physiology 32, 501--510. Student (1908) The probable error of the mean. Biometrika, 6, 20.

References

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

Aliases
  • sleep
Examples
library(datasets) 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 package datasets, version 3.3.0, License: Part of R 3.3.0

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