vcov.drc {drc}R Documentation

Calculating variance-covariance matrix for objects of class 'drc'

Description

'vcov' returns the estimated variance-covariance matrix for the parameters in the non-linear function.

Usage

  ## S3 method for class 'drc':
  vcov(object, ..., corr = FALSE)

Arguments

object an object of class 'drc'.
... additional arguments.
corr logical. If TRUE a correlation matrix is returned.

Value

A matrix of estimated variances and covariances.

Author(s)

Christian Ritz

Examples


## Fitting a four-parameter log-logistic model
ryegrass.m1 <- drm(rootl ~ conc, data = ryegrass, fct = LL.4())
vcov(ryegrass.m1)
vcov(ryegrass.m1, corr = TRUE)


[Package drc version 1.6-1 Index]