out = trees () ¶Diameter, Height and Volume for Black Cherry Trees
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.
GirthTree diameter (rather than girth, actually) in inches.
HeightHeight in ft.
VolumeVolume of timber in cubic feet.
Ryan, T. A., Joiner, B. L. and Ryan, B. F. (1976). The Minitab Student Handbook. Duxbury Press.
Atkinson, A. C. (1985). Plots, Transformations and Regression. Oxford: Oxford University Press.
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