datana (version 1.0.6)

treevol: Diameter, height and volume for Black Cherry Trees

Description

This data set provides measurements of the diameter, height and volume of timber in 31 felled black cherry trees. The records are a slight modification to the original dataframe "trees" from the \(datasets\) R package.

Usage

data(treevol)

Format

A data frame with 31 observations and three variables

dbh

Diameter at breast height, in cm.

toth

Total height, in m.

vtot

Timber volume, in cubic meters.

Examples

pairs(treevol, panel = panel.smooth, main = "treevol dataframe")
plot(vtot ~ dbh, data = treevol, log = "xy")
coplot(log(vtot) ~ log(dbh) | toth, data = treevol,
       panel = panel.smooth)
summary(m1 <- lm(log(vtot) ~ log(dbh), data = treevol))
summary(m2 <- update(m1, ~ . + log(toth), data = treevol))
anova(m1,m2)