Orange {datasets} | R Documentation |

## Growth of orange trees

### Description

The `Orange`

data frame has 35 rows and 3 columns of records of
the growth of orange trees.

### Usage

Orange

### Format

This data frame contains the following columns:

- Tree
- an ordered factor indicating the tree on which the measurement is
made. The ordering is according to increasing maximum diameter.
- age
- a numeric vector giving the age of the tree (days since 1968/12/31)
- circumference
- a numeric vector of trunk circumferences (mm). This is probably
“circumference at breast height”, a standard measurement in
forestry.

### Source

Draper, N. R. and Smith, H. (1998), *Applied Regression Analysis
(3rd ed)*, Wiley (exercise 24.N).

Pinheiro, J. C. and Bates, D. M. (2000) *Mixed-effects Models
in S and S-PLUS*, Springer.

### Examples

require(stats)
coplot(circumference ~ age | Tree, data = Orange, show = FALSE)
fm1 <- nls(circumference ~ SSlogis(age, Asym, xmid, scal),
data = Orange, subset = Tree == 3)
plot(circumference ~ age, data = Orange, subset = Tree == 3,
xlab = "Tree age (days since 1968/12/31)",
ylab = "Tree circumference (mm)", las = 1,
main = "Orange tree data and fitted model (Tree 3 only)")
age <- seq(0, 1600, len = 101)
lines(age, predict(fm1, list(age = age)))

[Package

*datasets* version 2.2.1

Index]