summary.nlsr: Summary output for nlsr object.

Description Usage Arguments Details Value Author(s) See Also

Description

Provide a summary output (but involving some serious computations!) of an object of class nlsr from nlxb or nlfb from package nlsr.

Usage

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    ## S3 method for class 'nlsr'
summary(object, ...)

Arguments

object

An object of class 'nlsr'

...

Currently ignored.

Details

summary.nlsr performs a summary method for an object of class 'nlsr' that has been created by a routine such as nlfb or nlxb for nonlinear least squares problems.

Issue: When there are bounded parameters, nls returns a Standard Error for each of the parameters. However, this summary does NOT have a Jacobian value (it is set to 0) for columns where a parameter is masked or at (or very close to) a bound. See the R code for the determination of whether we are at a bound. In this case, users may wish to look in the ‘inst/dev-codes’ directory of this package, where there is a script ‘seboundsnlsrx.R’ that computes the nls() standard errors for comparison on a simple problem.

Issue: The printsum() of this object includes the singular values of the Jacobian. These are displayed, one per coefficient row, with the coefficients. However, the Jacobian singular values do NOT have a direct correspondence to the coefficients on whose display row they appear. It simply happens that there are as many Jacobian singular values as coefficients, and this is a convenient place to display them. The same issue applies to the gradient components.

Value

returns an invisible copy of the nlsr object.

Author(s)

John C Nash <nashjc@uottawa.ca>

See Also

Function nls(), packages optim and optimx.



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