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Tread wear is estimated by two methods: weight loss and groove wear.
A data frame with 16 observations on the following 2 variables.
estimated wear (1000's of miles) base on weight loss
estimated wear (1000's of miles) based on groove wear
R. D. Stichler, G. G. Richey, and J. Mandel, "Measurement of Treadware of Commercial Tires", Rubber Age, 73:2 (May 1953).
data(TireWear) gf_point(weight ~ groove, data = TireWear)
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