ScotsPine {nlrwr}R Documentation

Leaf area index for Scots Pine trees

Description

Leaf area indices were calculated for Scots Pine trees in a region of Estonia.

Usage

data(ScotsPine)

Format

A data frame with 14 observations on the following 2 variables.

age
a numeric vector containing age of pine trees
lai
a numeric vector containing the leaf area indices

Source

Piegorsch, W. W. and Bailer, A. J. (2005) Analyzing Environmental Data, Chichester: John Wiley & Sons (p. 93).

Examples


## Plotting data
plot(lai~age, data=ScotsPine, xlab = "Age (years)", ylab = "Leaf area index" )

## Fitting the mono-exponenetial model 
expFct <- deriv3(~a+b*exp(-age/c), c("a","b","c"), function(a,b,c,age)NULL)
exp.m1 <- nls(lai~expFct(a, b, c, age), data=ScotsPine, start=list(a= 1, b=1 ,c=10))

## Calculating curvature measures
rms.curv(exp.m1)


[Package nlrwr version 1.0-6 Index]