trees
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| Attachment | Size |
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| dataset-59962.csv | 406 bytes |
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Girth, Height and Volume for Black Cherry TreesThis 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 (in inches) measured at 4 ft 6 in above the ground. Usagetrees FormatA data frame with 31 observations on 3 variables.
SourceRyan, T. A., Joiner, B. L. and Ryan, B. F. (1976) The Minitab Student Handbook. Duxbury Press. ReferencesAtkinson, A. C. (1985) Plots, Transformations and Regression. Oxford University Press. Examples
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
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