| % File src/library/stats/man/NLSstAsymptotic.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2010 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{NLSstAsymptotic} |
| \encoding{UTF-8} |
| \alias{NLSstAsymptotic} |
| \alias{NLSstAsymptotic.sortedXyData} |
| \title{Fit the Asymptotic Regression Model} |
| \usage{ |
| NLSstAsymptotic(xy) |
| } |
| \arguments{ |
| \item{xy}{a \code{sortedXyData} object} |
| } |
| \description{ |
| Fits the asymptotic regression model, in the form \code{b0 + |
| b1*(1-exp(-exp(lrc) * x))} to the \code{xy} data. |
| This can be used as a building block in determining starting estimates |
| for more complicated models. |
| } |
| \value{ |
| A numeric value of length 3 with components labelled \code{b0}, |
| \code{b1}, and \code{lrc}. \code{b0} is the estimated intercept on |
| the \code{y}-axis, \code{b1} is the estimated difference between the |
| asymptote and the \code{y}-intercept, and \code{lrc} is the estimated |
| logarithm of the rate constant. |
| } |
| \author{\enc{José}{Jose} Pinheiro and Douglas Bates} |
| \seealso{\code{\link{SSasymp}}} |
| \examples{ |
| Lob.329 <- Loblolly[ Loblolly$Seed == "329", ] |
| print(NLSstAsymptotic(sortedXyData(expression(age), |
| expression(height), |
| Lob.329)), digits = 3) |
| } |
| \keyword{manip} |