NLSstAsymptotic {nls}R Documentation

Fit the Asymptotic Regression Model

Description

Fits the asymptotic regression model, in the form b0 + b1*exp(-exp(lrc) * x) to the xy data. This can be used as a building block in determining starting estimates for more complicated models.

Usage

NLSstAsymptotic(xy)

Arguments

xy a sortedXyData object

Value

A numeric value of length 3 with components labelled b0, b1, and lrc

Author(s)

Jose Pinheiro and Douglas Bates

See Also

SSasymp

Examples

library( nls )
data( Loblolly )
Lob.329 <- Loblolly[ Loblolly$Seed == "329", ]
NLSstAsymptotic(sortedXyData(expression(age), expression(height), Lob.329 ))