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<!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: The Number of Breaks in Yarn during Weaving</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 warpbreaks {datasets}"><tr><td>warpbreaks {datasets}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>The Number of Breaks in Yarn during Weaving</h2> <h3>Description</h3> <p>This data set gives the number of warp breaks per loom, where a loom corresponds to a fixed length of yarn. </p> <h3>Usage</h3> <pre>warpbreaks</pre> <h3>Format</h3> <p>A data frame with 54 observations on 3 variables. </p> <table summary="Rd table"> <tr> <td style="text-align: right;"> <code>[,1]</code> </td><td style="text-align: left;"> <code>breaks</code> </td><td style="text-align: left;"> numeric </td><td style="text-align: left;"> The number of breaks</td> </tr> <tr> <td style="text-align: right;"> <code>[,2]</code> </td><td style="text-align: left;"> <code>wool</code> </td><td style="text-align: left;"> factor </td><td style="text-align: left;"> The type of wool (A or B)</td> </tr> <tr> <td style="text-align: right;"> <code>[,3]</code> </td><td style="text-align: left;"> <code>tension</code> </td><td style="text-align: left;"> factor </td><td style="text-align: left;"> The level of tension (L, M, H) </td> </tr> </table> <p>There are measurements on 9 looms for each of the six types of warp (<code>AL</code>, <code>AM</code>, <code>AH</code>, <code>BL</code>, <code>BM</code>, <code>BH</code>). </p> <h3>Source</h3> <p>Tippett, L. H. C. (1950) <em>Technological Applications of Statistics</em>. Wiley. Page 106. </p> <h3>References</h3> <p>Tukey, J. W. (1977) <em>Exploratory Data Analysis</em>. Addison-Wesley. </p> <p>McNeil, D. R. (1977) <em>Interactive Data Analysis</em>. Wiley. </p> <h3>See Also</h3> <p><code><a href="../../stats/html/xtabs.html">xtabs</a></code> for ways to display these data as a table. </p> <h3>Examples</h3> <pre> require(stats); require(graphics) summary(warpbreaks) opar <- par(mfrow = c(1, 2), oma = c(0, 0, 1.1, 0)) plot(breaks ~ tension, data = warpbreaks, col = "lightgray", varwidth = TRUE, subset = wool == "A", main = "Wool A") plot(breaks ~ tension, data = warpbreaks, col = "lightgray", varwidth = TRUE, subset = wool == "B", main = "Wool B") mtext("warpbreaks data", side = 3, outer = TRUE) par(opar) summary(fm1 <- lm(breaks ~ wool*tension, data = warpbreaks)) anova(fm1) </pre> <hr /><div style="text-align: center;">[Package <em>datasets</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>