EVOLUTION-MANAGER
Edit File: Orthodont.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: Growth curve data on an orthdontic measurement</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 Orthodont {nlme}"><tr><td>Orthodont {nlme}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Growth curve data on an orthdontic measurement</h2> <h3>Description</h3> <p>The <code>Orthodont</code> data frame has 108 rows and 4 columns of the change in an orthdontic measurement over time for several young subjects. </p> <h3>Format</h3> <p>This data frame contains the following columns: </p> <dl> <dt>distance</dt><dd> <p>a numeric vector of distances from the pituitary to the pterygomaxillary fissure (mm). These distances are measured on x-ray images of the skull. </p> </dd> <dt>age</dt><dd> <p>a numeric vector of ages of the subject (yr). </p> </dd> <dt>Subject</dt><dd> <p>an ordered factor indicating the subject on which the measurement was made. The levels are labelled <code>M01</code> to <code>M16</code> for the males and <code>F01</code> to <code>F13</code> for the females. The ordering is by increasing average distance within sex. </p> </dd> <dt>Sex</dt><dd> <p>a factor with levels <code>Male</code> and <code>Female</code> </p> </dd> </dl> <h3>Details</h3> <p>Investigators at the University of North Carolina Dental School followed the growth of 27 children (16 males, 11 females) from age 8 until age 14. Every two years they measured the distance between the pituitary and the pterygomaxillary fissure, two points that are easily identified on x-ray exposures of the side of the head. </p> <h3>Source</h3> <p>Pinheiro, J. C. and Bates, D. M. (2000), <em>Mixed-Effects Models in S and S-PLUS</em>, Springer, New York. (Appendix A.17) </p> <p>Potthoff, R. F. and Roy, S. N. (1964), “A generalized multivariate analysis of variance model useful especially for growth curve problems”, <em>Biometrika</em>, <b>51</b>, 313–326. </p> <h3>Examples</h3> <pre> formula(Orthodont) plot(Orthodont) </pre> <hr /><div style="text-align: center;">[Package <em>nlme</em> version 3.1-139 <a href="00Index.html">Index</a>]</div> </body></html>