R: Control Values for gnls Fit

gnlsControl {nlme}

R Documentation

Control Values for gnls Fit

Description

The values supplied in the function call replace the defaults and a list with all possible arguments is returned. The returned list is used as the control argument to the gnls function.

Usage

gnlsControl(maxIter = 50, nlsMaxIter = 7, msMaxIter = 50, minScale = 0.001,
            tolerance = 1e-6, nlsTol = 0.001, msTol = 1e-7,
            returnObject = FALSE, msVerbose = FALSE,
            apVar = TRUE, .relStep =,
            opt = c("nlminb", "optim"), optimMethod = "BFGS",
            minAbsParApVar = 0.05, sigma = NULL)

Arguments

`maxIter`	maximum number of iterations for the `gnls` optimization algorithm. Default is 50.
`nlsMaxIter`	maximum number of iterations for the `nls` optimization step inside the `gnls` optimization. Default is 7.
`msMaxIter`	maximum number of iterations for the `opt`imization step inside the `gnls` optimization. Default is 50.
`minScale`	minimum factor by which to shrink the default step size in an attempt to decrease the sum of squares in the `nls` step. Default 0.001.
`tolerance`	tolerance for the convergence criterion in the `gnls` algorithm. Default is 1e-6.
`nlsTol`	tolerance for the convergence criterion in `nls` step. Default is 1e-3.
`msTol`	tolerance for the convergence criterion of the first outer iteration when `optim` is used. Default is 1e-7.
`returnObject`	a logical value indicating whether the fitted object should be returned with a `warning` (instead of an error via `stop()`) when the maximum number of iterations is reached without convergence of the algorithm.
`msVerbose`	a logical value passed as the `trace` argument to the optimizer chosen by `opt`; see documentation on that. Default is `FALSE`.
`apVar`	a logical value indicating whether the approximate covariance matrix of the variance-covariance parameters should be calculated. Default is `TRUE`.
`.relStep`	relative step for numerical derivatives calculations. Default is `.Machine$double.eps^(1/3)` (about 6e-6).
`opt`	the optimizer to be used, either `"nlminb"` (the current default) or `"optim"` (the previous default).
`optimMethod`	character - the optimization method to be used with the `optim` optimizer. The default is `"BFGS"`. An alternative is `"L-BFGS-B"`.
`minAbsParApVar`	numeric value - minimum absolute parameter value in the approximate variance calculation. The default is `0.05`.
`sigma`	optionally a positive number to fix the residual error at. If `NULL`, as by default, or `0`, sigma is estimated.

Value

a list with components for each of the possible arguments.

Author(s)

José Pinheiro and Douglas Bates bates@stat.wisc.edu; the sigma option: Siem Heisterkamp and Bert van Willigen.

Examples

# decrease the maximum number of iterations and request tracing
gnlsControl(msMaxIter = 20, msVerbose = TRUE)

[Package nlme version 3.1-166 Index]