cu.summary data frame has 117 rows and 5 columns,
giving data on makes of cars taken from the April, 1990 issue of
This data frame contains the following columns:
a numeric vector giving the list price in US dollars of a standard model
of origin, a factor with levels Brazil, England, France, Germany, Japan, Japan/USA, Korea, Mexico, Sweden and USA
an ordered factor with levels Much worse < worse < average < better < Much better
fuel consumption miles per US gallon, as tested.
a factor with levels
Consumer Reports, April, 1990, pp. 235–288 quoted in
John M. Chambers and Trevor J. Hastie eds. (1992) Statistical Models in S, Wadsworth and Brooks/Cole, Pacific Grove, CA, pp. 46–47.
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