Description Format References Examples
Calcium levels before and after vitamin supplement
A data frame with 49 observations on the following 3 variables.
treatment
formulation - a factor with levels A
,
B
and C
before
Calcium level before the vitamin
after
Calcium level after the vitamin
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 | str(vitamin)
summary(vitamin)
show(plt1 <- xyplot(after ~ before, vitamin, groups = treatment,
auto.key = list(space = "right", title = "Formulation", lines = TRUE),
aspect = "iso",
type = c("g","p","smooth"),
xlab = "Calcium level before the vitamin",
ylab = "Calcium level after the vitamin"))
tmd(plt1, aspect = 1)
densityplot(~ I(after - before), vitamin, groups = treatment,
auto.key = list(columns = 3, lines = TRUE),
xlab = "Change in calcium level after taking vitamin")
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