# 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.

##### 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 3.1.2, License: Part of R 3.1.2*

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