Loblolly

From datasets v3.6.1 by R-core R-core@R-project.org

Growth of Loblolly pine trees

The Loblolly data frame has 84 rows and 3 columns of records of the growth of Loblolly pine trees.

Keywords: datasets

Usage

Loblolly

Details

This dataset was originally part of package nlme, and that has methods (including for [, as.data.frame, plot and print) for its grouped-data classes.

Format

An object of class c("nfnGroupedData", "nfGroupedData", "groupedData", "data.frame") containing the following columns:

height: a numeric vector of tree heights (ft).
age: a numeric vector of tree ages (yr).
Seed: an ordered factor indicating the seed source for the tree. The ordering is according to increasing maximum height.

Examples

library(datasets)

# NOT RUN {
require(stats); require(graphics)
plot(height ~ age, data = Loblolly, subset = Seed == 329,
     xlab = "Tree age (yr)", las = 1,
     ylab = "Tree height (ft)",
     main = "Loblolly data and fitted curve (Seed 329 only)")
fm1 <- nls(height ~ SSasymp(age, Asym, R0, lrc),
           data = Loblolly, subset = Seed == 329)
age <- seq(0, 30, length.out = 101)
lines(age, predict(fm1, list(age = age)))
# }

Documentation reproduced from package datasets, version 3.6.1, License: Part of R 3.6.1

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