Australian Eucalypt Hardwoods

The dataset consists of density and hardness measurements from 36 Australian Eucalypt hardwoods.

Format

A data frame with 36 observations on the following 2 variables.

Density

a measure of density of the timber

Hardness

the Janka hardness of the timber

Source

Williams, E.J. (1959) Regression Analysis. John Wiley & Sons, New York.

Details

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.

Examples

with(data = janka, plot(Hardness ~ Density, col = "blue"))