Loblolly

From datasets v3.2.2 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.

Source

Kung, F. H. (1986), Fitting logistic growth curve with predetermined carrying capacity, in Proceedings of the Statistical Computing Section, American Statistical Association, 340--343. Pinheiro, J. C. and Bates, D. M. (2000) Mixed-effects Models in S and S-PLUS, Springer.

Examples

library(datasets)

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 3.2.2, License: Part of R 3.2.2

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