Testing if there is a dose effect at all

Description

A significance test is provided for the comparison of the dose-response model considered and the simple linear regression model with slope 0 (a horizontal regression line corresponding to no dose effect)

Usage

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noEffect(object)

Arguments

object

an object of class 'drc'.

Details

Perhaps useful for screening purposes.

Value

The likelihood ratio test statistic and the corresponding degrees of freedom and p-value are reported.

Author(s)

Christian Ritz

Examples

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ryegrass.LL.4 <- drm(rootl ~ conc, data = ryegrass, fct = LL.4())

noEffect(ryegrass.LL.4)
# p-value < 0.0001: there is a highly significant dose effect!

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