EVOLUTION-MANAGER
Edit File: Rail.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: Evaluation of Stress in Railway Rails</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 Rail {nlme}"><tr><td>Rail {nlme}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Evaluation of Stress in Railway Rails</h2> <h3>Description</h3> <p>The <code>Rail</code> data frame has 18 rows and 2 columns. </p> <h3>Format</h3> <p>This data frame contains the following columns: </p> <dl> <dt>Rail</dt><dd> <p>an ordered factor identifying the rail on which the measurement was made. </p> </dd> <dt>travel</dt><dd> <p>a numeric vector giving the travel time for ultrasonic head-waves in the rail (nanoseconds). The value given is the original travel time minus 36,100 nanoseconds. </p> </dd> </dl> <h3>Details</h3> <p>Devore (2000, Example 10.10, p. 427) cites data from an article in <em>Materials Evaluation</em> on “a study of travel time for a certain type of wave that results from longitudinal stress of rails used for railroad track.” </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.26) </p> <p>Devore, J. L. (2000), <em>Probability and Statistics for Engineering and the Sciences (5th ed)</em>, Duxbury, Boston, MA. </p> <hr /><div style="text-align: center;">[Package <em>nlme</em> version 3.1-139 <a href="00Index.html">Index</a>]</div> </body></html>