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The Janka hardness of Australian hardwoods
data(janka)
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
The data give the Janka hardness (which is hard to measure) and the density of Australian hardwoods (which is easier to measure).
Williams, E. J. (1959) Regression Analysis, Wiley, New York.
data(janka) plot(janka)
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