

   MMoottoorr TTrreenndd RRooaadd TTeessttss

        data(mtcars)

   FFoorrmmaatt::

        A data frame with 32 observations on 11 variables.

         [, 1]     mpg      Miles/gallon
         [, 2]     cyl      Number of cylinders
         [, 3]     disp     Displacement (cu.in.)
         [, 4]     hp       Gross horsepower
         [, 5]     drat     Rear axle ratio
         [, 6]     wt       Weight (lb/1000)
         [, 7]     qsec     1/4 mile time
         [, 8]     vs       V/S
         [, 9]     am       Transmission (0 = automatic, 1 = manual)
         [,10]     gear     Number of forward gears
         [,11]     carb     Number of carburettors

   DDeessccrriippttiioonn::

        The data was extracted from 1974 Motor Trend magazine,
        and comprises gasoline mileage in gallons per mile
        (GPM) and 10 aspects of automobile design and perfor-
        mance for 32 automobiles (1973-74 models).

   SSoouurrccee::

        Henderson and Velleman (1981), Building multiple
        regression models interactively.  Biometrics, 37,
        391-411.

