twofactors {drc}R Documentation

Dose-response curves for multiple factors

Description

The dataset consists of several dose response curves for each combination of two factors that possibly influence the dose-response relationship.

Usage

data(twofactors)

Format

A data frame with 288 observations on the following 4 variables.

date
a factor with levels 02-05-2005 20-04-2005 25-04-2005
treatment
a factor with levels yes no
conc
a numeric vector of concentrations/doses
length
a numeric vector of plant lengths

Details

It turns out that the two factors only need to enter the model for the parameter e, in an additive way.

Source

Artificial data

References

Examples


model1 <- multdrc(length ~ conc,
          date:treatment,
          data = twofactors, fct = l3(),
          collapse =
          list(~date:treatment-1, ~date:treatment-1,
               ~date:treatment-1),
          na.action=na.omit)
          
summary(model1)

rm(model1)

[Package drc version 1.1-0 Index]