t_coef: Transformation of Coefficients.
In VFP: Variance Function Program

t_coef

R Documentation

Transformation of Coefficients.

Description

This function performs transformation from the original parameterization into the 'VFP'-package internal re-parameterized form.

Usage

t_coef(
  coeffs0,
  K = NULL,
  Maxi = NULL,
  model = NULL,
  signJ = NULL,
  eps = sqrt(.Machine$double.eps),
  ...
)

Arguments

`coeffs0`	(numeric) vector of function coefficients to be transformed into the re-parameterized form
`K`	(numeric) constant value 'K'
`Maxi`	(numeric) max. value
`model`	(integer) specifying which model shall be back-transformed
`signJ`	(integer) either 1 or -1
`eps`	(numeric) constant used instead of zero in case of log-transformation
`...`	additional parameters

Details

In the 'VFP' package models are re-parameterized to have better control over the constrained solution-space, i.e. only models may be fitted generating non-negative fitted values. This function is intended to be for internal use only.