EngrExpt (version 0.1-6)

computer: Repair time of computers

Description

Data from a study of the repair time for different brands of computers in different configurations.

References

Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)

Examples

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))