NLSstLfAsymptote: Horizontal Asymptote on the Left Side

Description Usage Arguments Value Author(s) See Also Examples

Description

Provide an initial guess at the horizontal asymptote on the left side (i.e., small 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

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Arguments

xy

a sortedXyData object

Value

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

Author(s)

José Pinheiro and Douglas Bates

See Also

sortedXyData, NLSstClosestX, NLSstRtAsymptote, selfStart

Examples

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