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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 Effect of Vitamin C on Tooth Growth in Guinea Pigs</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 ToothGrowth {datasets}"><tr><td>ToothGrowth {datasets}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>The Effect of Vitamin C on Tooth Growth in Guinea Pigs</h2> <h3>Description</h3> <p>The response is the length of odontoblasts (cells responsible for tooth growth) in 60 guinea pigs. Each animal received one of three dose levels of vitamin C (0.5, 1, and 2 mg/day) by one of two delivery methods, orange juice or ascorbic acid (a form of vitamin C and coded as <code>VC</code>). </p> <h3>Usage</h3> <pre>ToothGrowth</pre> <h3>Format</h3> <p>A data frame with 60 observations on 3 variables. </p> <table summary="Rd table"> <tr> <td style="text-align: right;"> [,1] </td><td style="text-align: left;"> len </td><td style="text-align: left;"> numeric </td><td style="text-align: left;"> Tooth length</td> </tr> <tr> <td style="text-align: right;"> [,2] </td><td style="text-align: left;"> supp </td><td style="text-align: left;"> factor </td><td style="text-align: left;"> Supplement type (VC or OJ).</td> </tr> <tr> <td style="text-align: right;"> [,3] </td><td style="text-align: left;"> dose </td><td style="text-align: left;"> numeric </td><td style="text-align: left;"> Dose in milligrams/day </td> </tr> </table> <h3>Source</h3> <p>C. I. Bliss (1952). <em>The Statistics of Bioassay</em>. Academic Press. </p> <h3>References</h3> <p>McNeil, D. R. (1977). <em>Interactive Data Analysis</em>. New York: Wiley. </p> <p>Crampton, E. W. (1947). The growth of the odontoblast of the incisor teeth as a criterion of vitamin C intake of the guinea pig. <em>The Journal of Nutrition</em>, <b>33</b>(5), 491–504. doi: <a href="https://doi.org/10.1093/jn/33.5.491">10.1093/jn/33.5.491</a>. </p> <h3>Examples</h3> <pre> require(graphics) coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth, xlab = "ToothGrowth data: length vs dose, given type of supplement") </pre> <hr /><div style="text-align: center;">[Package <em>datasets</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>