vcov.nlstac {nlstac}

Calculate Variance-Covariance Matrix for a nlstac Fitted Model Object

Description

Returns the variance-covariance matrix of the main parameters of a fitted model object. The “main” parameters of model correspond to those returned by coef,

Usage

## S3 method for class 'nlstac'
vcov(object, ...)

Arguments

object

An object of class "nlstac" obtained by the nls_tac function.

...

Ignored, for compatibility issues.

Value

A matrix of the estimated covariances between the parameter estimates.

Author(s)

Mariano Rodríguez-Arias ([e-mail]). Deptartment of Mathematics

Juan Antonio Fernández Torvisco ([e-mail]). Department of Mathematics

University of Extremadura (Spain)

Rafael Benítez ([e-mail]). Department of Business Mathematics

University of Valencia (Spain)