Tire Wear

The data frame TireWear contains measurements for the amount of tread loss after 10,000 miles of driving in thousandths of an inch. Data are used in Example 11.8.

Format

A data frame with 16 observations on the following 3 variables:

Wear

tread loss measured in thousandths of an inch

Treat

a factor with levels A, B, C, and D

Block

a factor with levels Car1, Car2, Car3, and Car4

Source

Ugarte, M. D., Militino, A. F., and Arnholt, A. T. (2008) Probability and Statistics with R. Chapman & Hall/CRC.

Examples

par(mfrow = c(1, 2), cex = 0.8)
with(data = TireWear,
interaction.plot(Treat, Block, Wear, type = "b", legend = FALSE))
with(data = TireWear,
interaction.plot(Block, Treat, Wear, type = "b", legend = FALSE))
par(mfrow = c(1, 1), cex = 1)