Loblolly
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)))
# }
Community examples
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