EngrExpt (version 0.1-6)

battery: Battery lifetime in laptop computers

Description

Data from a study on the effect of different processors on the battery lifetime in laptop computers.

References

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

Examples

str(battery)
densityplot(~ lifetime, battery, groups = type,
            xlab = "Battery lifetime (hours)",
            auto.key = list(columns = 3, lines = TRUE))
densityplot(~ lifetime, battery, groups = type,
            scales = list(x = list(log = 2)),
            xlab = "Battery lifetime (hours) - logarithmic scale",
            auto.key = list(columns = 3, lines = TRUE))
dotplot(reorder(as.factor(type), lifetime) ~ lifetime, battery,
        jitter.y = TRUE,
        xlab = "Battery lifetime (hours)",
        ylab = "Type", type = c("p", "a"))
dotplot(reorder(as.factor(type), lifetime) ~ lifetime, battery,
        jitter.y = TRUE, scales = list(x = list(log = 2)),
        xlab = "Battery lifetime (hours) - logarithmic scale",
        ylab = "Type", type = c("p", "a"))