warpbreaks <-
data.frame(breaks = c(26, 30, 54, 25, 70, 52, 51, 26, 67, 18, 21, 29,
17, 12, 18, 35, 30, 36, 36, 21, 24, 18, 10, 43, 28, 15, 26, 27, 14, 29,
19, 29, 31, 41, 20, 44, 42, 26, 19, 16, 39, 28, 21, 39, 29, 20, 21, 24,
17, 13, 15, 15, 16, 28), wool = structure(factor(c(1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2),
levels=1:2), .Label = c("A", "B")), tension = structure(factor(c(1, 1,
1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,
3, 3, 3, 3), levels=1:3), .Label = c("L", "M", "H")))