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.

Keywords
datasets
Usage
trees
Format

A data frame with 31 observations on 3 variables.

[,1] Girth numeric Tree diameter (rather than girth, actually) in inches
[,2] Height numeric Height in ft
[,3] Volume numeric Volume of timber in cubic ft

References

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

Aliases
  • trees
Examples
library(datasets) # NOT RUN { require(stats); require(graphics) 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)) summary(fm2 <- update(fm1, ~ . + log(Height), data = trees)) step(fm2) ## i.e., Volume ~= c * Height * Girth^2 seems reasonable # }
Documentation reproduced from package datasets, version 3.6.1, License: Part of R 3.6.1

Community examples

Looks like there are no examples yet.