janka {PASWR}

Australian Eucalypt Hardwoods

Description

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

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.

Source

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

Examples

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