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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: Motor Trend Car Road Tests</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 mtcars {datasets}"><tr><td>mtcars {datasets}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Motor Trend Car Road Tests</h2> <h3>Description</h3> <p>The data was extracted from the 1974 <em>Motor Trend</em> US magazine, and comprises fuel consumption and 10 aspects of automobile design and performance for 32 automobiles (1973–74 models). </p> <h3>Usage</h3> <pre>mtcars</pre> <h3>Format</h3> <p>A data frame with 32 observations on 11 (numeric) variables. </p> <table summary="Rd table"> <tr> <td style="text-align: right;"> [, 1] </td><td style="text-align: left;"> mpg </td><td style="text-align: left;"> Miles/(US) gallon </td> </tr> <tr> <td style="text-align: right;"> [, 2] </td><td style="text-align: left;"> cyl </td><td style="text-align: left;"> Number of cylinders </td> </tr> <tr> <td style="text-align: right;"> [, 3] </td><td style="text-align: left;"> disp </td><td style="text-align: left;"> Displacement (cu.in.) </td> </tr> <tr> <td style="text-align: right;"> [, 4] </td><td style="text-align: left;"> hp </td><td style="text-align: left;"> Gross horsepower </td> </tr> <tr> <td style="text-align: right;"> [, 5] </td><td style="text-align: left;"> drat </td><td style="text-align: left;"> Rear axle ratio </td> </tr> <tr> <td style="text-align: right;"> [, 6] </td><td style="text-align: left;"> wt </td><td style="text-align: left;"> Weight (1000 lbs) </td> </tr> <tr> <td style="text-align: right;"> [, 7] </td><td style="text-align: left;"> qsec </td><td style="text-align: left;"> 1/4 mile time </td> </tr> <tr> <td style="text-align: right;"> [, 8] </td><td style="text-align: left;"> vs </td><td style="text-align: left;"> Engine (0 = V-shaped, 1 = straight) </td> </tr> <tr> <td style="text-align: right;"> [, 9] </td><td style="text-align: left;"> am </td><td style="text-align: left;"> Transmission (0 = automatic, 1 = manual) </td> </tr> <tr> <td style="text-align: right;"> [,10] </td><td style="text-align: left;"> gear </td><td style="text-align: left;"> Number of forward gears </td> </tr> <tr> <td style="text-align: right;"> [,11] </td><td style="text-align: left;"> carb </td><td style="text-align: left;"> Number of carburetors </td> </tr> </table> <h3>Note</h3> <p>Henderson and Velleman (1981) comment in a footnote to Table 1: ‘Hocking [original transcriber]'s noncrucial coding of the Mazda's rotary engine as a straight six-cylinder engine and the Porsche's flat engine as a V engine, as well as the inclusion of the diesel Mercedes 240D, have been retained to enable direct comparisons to be made with previous analyses.’ </p> <h3>Source</h3> <p>Henderson and Velleman (1981), Building multiple regression models interactively. <em>Biometrics</em>, <b>37</b>, 391–411. </p> <h3>Examples</h3> <pre> require(graphics) pairs(mtcars, main = "mtcars data", gap = 1/4) coplot(mpg ~ disp | as.factor(cyl), data = mtcars, panel = panel.smooth, rows = 1) ## possibly more meaningful, e.g., for summary() or bivariate plots: mtcars2 <- within(mtcars, { vs <- factor(vs, labels = c("V", "S")) am <- factor(am, labels = c("automatic", "manual")) cyl <- ordered(cyl) gear <- ordered(gear) carb <- ordered(carb) }) summary(mtcars2) </pre> <hr /><div style="text-align: center;">[Package <em>datasets</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>