Battery lifetime in laptop computers
Data from a study on the effect of different processors on the battery lifetime in laptop computers.
A data frame with 30 observations on the following 2 variables.
typeprocessor type - a factor with levels A,
B and C
lifetimea numeric vector
Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)
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"))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.