Loblolly {datasets} | R Documentation |
The Loblolly
data frame has 84 rows and 3 columns of records of
the growth of Loblolly pine trees.
Loblolly
This object of class c("nfnGroupedData", "nfGroupedData",
"groupedData", "data.frame")
containing the following columns:
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.
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.
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)))