| % File src/library/datasets/man/Orange.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2011 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{Orange} |
| \docType{data} |
| \alias{Orange} |
| \title{Growth of Orange Trees} |
| \description{ |
| The \code{Orange} data frame has 35 rows and 3 columns of records of |
| the growth of orange trees. |
| } |
| \usage{Orange} |
| \format{ |
| An object of class |
| \code{c("nfnGroupedData", "nfGroupedData", "groupedData", "data.frame")} |
| containing the following columns: |
| \describe{ |
| \item{Tree}{ |
| an ordered factor indicating the tree on which the measurement is |
| made. The ordering is according to increasing maximum diameter. |
| } |
| \item{age}{ |
| a numeric vector giving the age of the tree (days since 1968/12/31) |
| } |
| \item{circumference}{ |
| a numeric vector of trunk circumferences (mm). This is probably |
| \dQuote{circumference at breast height}, a standard measurement in |
| forestry. |
| } |
| } |
| } |
| \details{ |
| This dataset was originally part of package \code{nlme}, and that has |
| methods (including for \code{[}, \code{as.data.frame}, \code{plot} and |
| \code{print}) for its grouped-data classes. |
| } |
| \source{ |
| Draper, N. R. and Smith, H. (1998), \emph{Applied Regression Analysis |
| (3rd ed)}, Wiley (exercise 24.N). |
| |
| Pinheiro, J. C. and Bates, D. M. (2000) \emph{Mixed-effects Models |
| in S and S-PLUS}, Springer. |
| } |
| \examples{ |
| require(stats); require(graphics) |
| coplot(circumference ~ age | Tree, data = Orange, show.given = 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, length.out = 101) |
| lines(age, predict(fm1, list(age = age))) |
| } |
| \keyword{datasets} |