Janka hardness

Description

The Janka hardness of Australian hardwoods

Usage

data(janka)

Format

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

Density

the hardwood density (units unknown); a numeric vector

Hardness

the Janka hardness (units unknown); a numeric vector

Details

The data give the Janka hardness (which is hard to measure) and the density of Australian hardwoods (which is easier to measure).

Source

W. N. Venables (1998) Exegeses on linear models. In S-Plus User's Conference, Washington DC.

References

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

Examples

   data(janka)
   plot(janka)