NLSstLfAsymptote 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)
José Pinheiro and Douglas Bates
See Also
sortedXyData, NLSstClosestX, NLSstRtAsymptote, selfStart
Examples
DNase.2 <- DNase[ DNase$Run == "2", ]
DN.srt <- sortedXyData( expression(log(conc)), expression(density), DNase.2 )
NLSstLfAsymptote( DN.srt )
Copyright (©) 1999–2012 R Foundation for Statistical Computing.
Licensed under the GNU General Public License.