NLSstRtAsymptote {nls}

R Documentation

Horizontal Asymptote on the Right Side

Description

Provide an initial guess at the horizontal asymptote on the right side (i.e. large values of x) of the graph of y versus x from the xy object. Primarily used within initial functions for self-starting nonlinear regression models.

Usage

NLSstRtAsymptote(xy)

Arguments

xy	a sortedXyData object

Value

A single numeric value estimating the horizontal asymptote for large x.

Author(s)

Jose Pinheiro and Douglas Bates

See Also

sortedXyData, NLSstClosestX, NLSstRtAsymptote, selfStart

Examples

data( DNase )
DNase.2 <- DNase[ DNase$Run == "2", ]
DN.srt <- sortedXyData( expression(log(conc)), expression(density), DNase.2 )
NLSstRtAsymptote( DN.srt )