VFP (version 1.4.3)

t_coef: 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),
  ...
)

Value

(numeric) vector of coefficients in re-parameterized form

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

Author

Andre Schuetzenmeister Florian Dufey

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.