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8.2.45.70 octave.dataset.trees ¶

Static Method: out = trees () ¶

Diameter, Height and Volume for Black Cherry Trees

Description ¶

This data set provides measurements of the diameter, height and volume of timber in 31 felled black cherry trees. Note that the diameter (in inches) is erroneously labelled Girth in the data. It is measured at 4 ft 6 in above the ground.

Format ¶

Girth

Tree diameter (rather than girth, actually) in inches.

Height

Height in ft.

Volume

Volume of timber in cubic feet.

Source ¶

Ryan, T. A., Joiner, B. L. and Ryan, B. F. (1976). The Minitab Student Handbook. Duxbury Press.

References ¶

Atkinson, A. C. (1985). Plots, Transformations and Regression. Oxford: Oxford University Press.

Examples ¶

t = octave.dataset.trees;

figure
octave.examples.plot_pairs (t);

figure
loglog (t.Girth, t.Volume)
xlabel ("Girth")
ylabel ("Volume")

# TODO: Transform to log space for the coplot

# TODO: Linear model