The dataset consists of density and hardness measurements from 36 Australian Eucalypt hardwoods.
A data frame with 36 observations on the following 2 variables.
a measure of density of the timber
the Janka hardness of the timber
Janka Hardness is an importance rating of Australian hardwood timbers. The test measures the force required to imbed a steel ball into a piece of wood.
Williams, E.J. (1959) Regression Analysis. John Wiley & Sons, New York.
with(data = janka, plot(Hardness ~ Density, col = "blue"))
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