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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| Curated Data | File Size |
|---|---|
| OpenIntro Statistics Dataset - yrbss_samp | 7.62 KB |
| OpenIntro Statistics Dataset - yrbss | 1.03 MB |
| OpenIntro Statistics Dataset - yawn | 861 bytes |
| OpenIntro Statistics Dataset - xom | 4.95 KB |
| OpenIntro Statistics Dataset - winery_cars | 489 bytes |
| All Public Datasets | File Size |
|---|---|
| PSID | |
| wage1 | 328 bytes |
| OpenIntro Statistics Dataset - yrbss_samp | 7.62 KB |
| OpenIntro Statistics Dataset - yrbss | 1.03 MB |
| OpenIntro Statistics Dataset - yawn | 861 bytes |
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