JANKA {PASWR2}

Australian Eucalypt Hardwoods

Description

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

Usage

JANKA

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 a structural property of Australian hardwood timbers. The Janka hardness 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.

References

Ugarte, M. D., Militino, A. F., and Arnholt, A. T. 2015. Probability and Statistics with R, Second Edition. Chapman & Hall / CRC.

Examples

ggplot(data = JANKA, aes(x = density, y = hardness)) + geom_point() + geom_smooth()