Insurance injury ratings of Chevrolet vehicles for 1990 and 1993 models
Data for Exercise 8.35
Chevy
A data frame/tibble with 67 observations on two variables
a factor with levels 1988-90 and
1991-93
a factor with levels much better than average, above average,
average, below average, and much worse than average
Insurance Institute for Highway Safety and the Highway Loss Data Institute, 1995.
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
T1 <- xtabs(~year + frequency, data = Chevy) T1 chisq.test(T1) rm(T1)
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