update.drc: Updating and re-fitting a model

In drc: Dose-Response Analysis Using R

Updating and re-fitting a model

Description

'update' updates and re-fits a model on the basis of an object of class 'drc'.

Usage

  ## S3 method for class 'drc'
update(object, ..., evaluate = TRUE)

Arguments

object	an object of class 'drc'.
...	arguments to alter in object.
evaluate	logical. If TRUE model is re-fit; otherwise an unevaluated call is returned.

Value

An object of class 'drc'.

Author(s)

Christian Ritz

Examples

## Fitting a four-parameter Weibull model
model1 <- drm(ryegrass, fct = W1.4())

## Updating 'model1' by fitting a three-parameter Weibull model instead
model2 <- update(model1, fct = W1.3())
anova(model2, model1)

drc documentation built on Sept. 29, 2026, 5:09 p.m.