| NLSstLfAsymptote {nls} | R Documentation |
Horizontal Asymptote on the Left Side
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
NLSstLfAsymptote(xy)
Arguments
xy |
a |
Value
A single numeric value estimating the horizontal asymptote for small
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 )
NLSstLfAsymptote( DN.srt )