trees {base}R Documentation

Girth, Height and Volume for Black Cherry Trees

Description

This data set provides measurements of the girth, height and volume of timber in 31 felled black cherry trees. Note that girth is the diameter of the tree at 4 ft 6 in above the ground.

Usage

data(trees)

Source

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

References

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

Examples

data(trees)
pairs(trees, panel = panel.smooth, main = "trees data")
plot(Volume ~ Girth, data = trees, log = "xy")
coplot(log(Volume) ~ log(Girth) | Height, data = trees,
       panel = panel.smooth)
summary(fm1 <- lm(log(Volume) ~ log(Girth), data = trees))


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