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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: Automobile Data from 'Consumer Reports' 1990</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 car90 {rpart}"><tr><td>car90 {rpart}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Automobile Data from 'Consumer Reports' 1990</h2> <h3>Description</h3> <p>Data on 111 cars, taken from pages 235–255, 281–285 and 287–288 of the April 1990 <em>Consumer Reports</em> Magazine. </p> <h3>Usage</h3> <pre>data(car90)</pre> <h3>Format</h3> <p>The data frame contains the following columns </p> <dl> <dt>Country</dt><dd><p>a factor giving the country in which the car was manufactured</p> </dd> <dt>Disp</dt><dd><p>engine displacement in cubic inches</p> </dd> <dt>Disp2</dt><dd><p>engine displacement in liters</p> </dd> <dt>Eng.Rev</dt><dd><p>engine revolutions per mile, or engine speed at 60 mph</p> </dd> <dt>Front.Hd</dt><dd><p>distance between the car's head-liner and the head of a 5 ft. 9 in. front seat passenger, in inches, as measured by CU</p> </dd> <dt>Frt.Leg.Room</dt><dd><p>maximum front leg room, in inches, as measured by CU</p> </dd> <dt>Frt.Shld</dt><dd><p>front shoulder room, in inches, as measured by CU</p> </dd> <dt>Gear.Ratio</dt><dd><p>the overall gear ratio, high gear, for manual transmission</p> </dd> <dt>Gear2</dt><dd><p>the overall gear ratio, high gear, for automatic transmission</p> </dd> <dt>HP</dt><dd><p>net horsepower</p> </dd> <dt>HP.revs</dt><dd><p>the red line—the maximum safe engine speed in rpm</p> </dd> <dt>Height</dt><dd><p>height of car, in inches, as supplied by manufacturer</p> </dd> <dt>Length</dt><dd><p>overall length, in inches, as supplied by manufacturer</p> </dd> <dt>Luggage</dt><dd><p>luggage space</p> </dd> <dt>Mileage</dt><dd><p>a numeric vector of gas mileage in miles/gallon as tested by CU; contains NAs.</p> </dd> <dt>Model2</dt><dd><p>alternate name, if the car was sold under two labels</p> </dd> <dt>Price</dt><dd><p>list price with standard equipment, in dollars</p> </dd> <dt>Rear.Hd</dt><dd><p>distance between the car's head-liner and the head of a 5 ft 9 in. rear seat passenger, in inches, as measured by CU</p> </dd> <dt>Rear.Seating</dt><dd><p>rear fore-and-aft seating room, in inches, as measured by CU</p> </dd> <dt>RearShld</dt><dd><p>rear shoulder room, in inches, as measured by CU</p> </dd> <dt>Reliability</dt><dd><p>an ordered factor with levels <span class="samp">Much worse</span> < <span class="samp">worse</span> < <span class="samp">average</span> < <span class="samp">better</span> < <span class="samp">Much better</span>: contains <code>NA</code>s.</p> </dd> <dt>Rim</dt><dd><p>factor giving the rim size</p> </dd> <dt>Sratio.m</dt><dd><p>Number of turns of the steering wheel required for a turn of 30 foot radius, manual steering</p> </dd> <dt>Sratio.p</dt><dd><p>Number of turns of the steering wheel required for a turn of 30 foot radius, power steering</p> </dd> <dt>Steering</dt><dd><p>steering type offered: manual, power, or both</p> </dd> <dt>Tank</dt><dd><p>fuel refill capacity in gallons</p> </dd> <dt>Tires</dt><dd><p>factor giving tire size</p> </dd> <dt>Trans1</dt><dd><p>manual transmission, a factor with levels <span class="samp"></span>, <span class="samp">man.4</span>, <span class="samp">man.5</span> and <span class="samp">man.6</span></p> </dd> <dt>Trans2</dt><dd><p>automatic transmission, a factor with levels <span class="samp"></span>, <span class="samp">auto.3</span>, <span class="samp">auto.4</span>, and <span class="samp">auto.CVT</span>. No car is missing both the manual and automatic transmission variables, but several had both as options</p> </dd> <dt>Turning</dt><dd><p>the radius of the turning circle in feet</p> </dd> <dt>Type</dt><dd><p>a factor giving the general type of car. The levels are: <span class="samp">Small</span>, <span class="samp">Sporty</span>, <span class="samp">Compact</span>, <span class="samp">Medium</span>, <span class="samp">Large</span>, <span class="samp">Van</span></p> </dd> <dt>Weight</dt><dd><p>an order statistic giving the relative weights of the cars; 1 is the lightest and 111 is the heaviest</p> </dd> <dt>Wheel.base</dt><dd><p>length of wheelbase, in inches, as supplied by manufacturer</p> </dd> <dt>Width</dt><dd><p>width of car, in inches, as supplied by manufacturer</p> </dd> </dl> <h3>Source</h3> <p>This is derived (with permission) from the data set <code>car.all</code> in S-PLUS, but with some further clean up of variable names and definitions. </p> <h3>See Also</h3> <p><code><a href="car.test.frame.html">car.test.frame</a></code>, <code><a href="cu.summary.html">cu.summary</a></code> for extracts from other versions of the dataset. </p> <h3>Examples</h3> <pre> data(car90) plot(car90$Price/1000, car90$Weight, xlab = "Price (thousands)", ylab = "Weight (lbs)") mlowess <- function(x, y, ...) { keep <- !(is.na(x) | is.na(y)) lowess(x[keep], y[keep], ...) } with(car90, lines(mlowess(Price/1000, Weight, f = 0.5))) </pre> <hr /><div style="text-align: center;">[Package <em>rpart</em> version 4.1-15 <a href="00Index.html">Index</a>]</div> </body></html>