Injury level versus seatbelt usage
Data for Exercise 8.24
Seatbelt
A data frame/tibble with 86,759 observations on two variables
a factor with levels No and Yes
a factor with levels None, Minimal,
Minor, or Major indicating the extent of the drivers injuries
Jobson, J. (1982), Applied Multivariate Data Analysis, Springer-Verlag, New York, p. 18.
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
T1 <- xtabs(~seatbelt + injuries, data = Seatbelt) T1 chisq.test(T1) rm(T1)
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