EVOLUTION-MANAGER
Edit File: sleep.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Student's Sleep Data</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for sleep {datasets}"><tr><td>sleep {datasets}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Student's Sleep Data</h2> <h3>Description</h3> <p>Data which show the effect of two soporific drugs (increase in hours of sleep compared to control) on 10 patients. </p> <h3>Usage</h3> <pre>sleep</pre> <h3>Format</h3> <p>A data frame with 20 observations on 3 variables. </p> <table summary="Rd table"> <tr> <td style="text-align: right;"> [, 1] </td><td style="text-align: left;"> extra </td><td style="text-align: left;"> numeric </td><td style="text-align: left;"> increase in hours of sleep</td> </tr> <tr> <td style="text-align: right;"> [, 2] </td><td style="text-align: left;"> group </td><td style="text-align: left;"> factor </td><td style="text-align: left;"> drug given</td> </tr> <tr> <td style="text-align: right;"> [, 3] </td><td style="text-align: left;"> ID </td><td style="text-align: left;"> factor </td><td style="text-align: left;"> patient ID </td> </tr> </table> <h3>Details</h3> <p>The <code>group</code> variable name may be misleading about the data: They represent measurements on 10 persons, not in groups. </p> <h3>Source</h3> <p>Cushny, A. R. and Peebles, A. R. (1905) The action of optical isomers: II hyoscines. <em>The Journal of Physiology</em> <b>32</b>, 501–510. </p> <p>Student (1908) The probable error of the mean. <em>Biometrika</em>, <b>6</b>, 20. </p> <h3>References</h3> <p>Scheffé, Henry (1959) <em>The Analysis of Variance</em>. New York, NY: Wiley. </p> <h3>Examples</h3> <pre> 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)) </pre> <hr /><div style="text-align: center;">[Package <em>datasets</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>