The Orange data frame has 35 rows and 4 columns of records of the growth of orange trees.
An object of class c("nfnGroupedData", "nfGroupedData", "groupedData", "data.frame") containing 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.
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.
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.
Use the following R code to directly access this dataset in R.
