Repair time of computers
Data from a study of the repair time for different brands of computers in different configurations.
A data frame with 36 observations on the following 3 variables.
a factor with levels
an ordered factor with levels
time to repair computer (minutes)
Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)
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str(computer) dotplot(type ~ time, computer, groups = brand, auto.key = list(columns = 3, lines = TRUE), type = c("p","a"), jitter.y = TRUE, xlab = "Time to repair computer (minutes)") summary(fm1 <- lm(time ~ brand * type, computer)) summary(fm2 <- lm(time ~ brand + type, computer)) summary(fm3 <- lm(time ~ type, computer))
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