Loblolly(datasets)
Loblolly()所属R语言包:datasets
Growth of Loblolly pine trees
火炬松松树的生长
译者:生物统计家园网 机器人LoveR
描述----------Description----------
The Loblolly data frame has 84 rows and 3 columns of records of the growth of Loblolly pine trees.
Loblolly数据框有84行和第3列,火炬松松树的生长记录。
用法----------Usage----------
格式----------Format----------
This object of class c("nfnGroupedData", "nfGroupedData", "groupedData", "data.frame") containing the following columns:
本类c("nfnGroupedData", "nfGroupedData", "groupedData", "data.frame")包含下列对象:
a numeric vector of tree heights (ft).
一树的高度(英尺)的数字向量。
a numeric vector of tree ages (yr).
树龄的数字矢量(年)。
an ordered factor indicating the seed source for the tree. The ordering is according to increasing maximum height.
一个有序的因素,说明树的种子源。排序是根据增加的最大高度。
Details
详情----------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.
此数据集原是包nlme部分,并具有分组数据类的方法(包括[,as.data.frame,plot和print) 。
源----------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.
西贡,FH(1986),预定承载能力拟合Logistic生长曲线,进行统计计算组,美国统计协会,340-343。
Pinheiro, J. C. and Bates, D. M. (2000) Mixed-effects Models in S and S-PLUS, Springer.
皮涅伊罗,JC和Bates,DM(2000)混合效应模型在S和S-PLUS,施普林格。
举例----------Examples----------
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)))
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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