From jose.perezsuarez at csiro.au  Thu Mar  5 05:58:14 2009
From: jose.perezsuarez at csiro.au (per243)
Date: Wed, 4 Mar 2009 20:58:14 -0800 (PST)
Subject: [Rd]  problems with nls?
Message-ID: <22345292.post@talk.nabble.com>


I need to make nonlinear regression with the posterior script, but how is the
problem? I have error in library (nls), package 'nls' has been merged into
'stats'.
I need help?
What other forms I have to make nonlinear regression? and how I find to
calculate statistics y residuals, scatterplot.

thanks



SCRIPT

ros<-read.table("Dataset.csv",header=T,sep=",")
ros
attach(ros)


# preliminaries

options(width=44)
options(digits=3)
    
## Nonlinear Regression

par(mfrow=c(1,2))

attach(ros)
plot(U1.7km, R, main="(a)")


library(nls)
mod1<-nls(R ~
beta1*(U1.7km^beta2)+(Hm^beta3)),start=list(beta1=2.031,beta2=0.800,beta3=-0.255),
trace = TRUE)

summary(mod1)
coef(mod1)
coef(summary(mod1))

lines(R, fitted.values(mod1), lwd=2)

plot(R, residuals(mod1), type="b", main="(b)")
abline(h=0, lty=2)

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[Rd] problems with nls?
per243