Description Format References Examples
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.
type
processor type - a factor with levels A
,
B
and C
lifetime
a numeric vector
Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | 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"))
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