| warpbreaks | R Documentation |
This data set gives the number of warp breaks per loom, where a loom corresponds to a fixed length of yarn.
warpbreaks
A data frame with 54 observations on 3 variables.
[,1] | breaks | numeric | The number of breaks |
[,2] | wool | factor | The type of wool (A or B) |
[,3] | tension | factor | The level of tension (L, M, H) |
There are measurements on 9 looms for each of the six types of warp
(AL, AM, AH, BL, BM, BH).
Tippett, L. H. C. (1950) Technological Applications of Statistics. Wiley. Page 106.
Tukey, J. W. (1977) Exploratory Data Analysis. Addison-Wesley.
McNeil, D. R. (1977) Interactive Data Analysis. Wiley.
xtabs for ways to display these data as a table.
require(stats); require(graphics)
summary(warpbreaks)
opar <- par(mfrow = c(1, 2), oma = c(0, 0, 1.1, 0))
plot(breaks ~ tension, data = warpbreaks, col = "lightgray",
varwidth = TRUE, subset = wool == "A", main = "Wool A")
plot(breaks ~ tension, data = warpbreaks, col = "lightgray",
varwidth = TRUE, subset = wool == "B", main = "Wool B")
mtext("warpbreaks data", side = 3, outer = TRUE)
par(opar)
summary(fm1 <- lm(breaks ~ wool*tension, data = warpbreaks))
anova(fm1)
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