TM {drc}R Documentation

A suite of bioassays

Description

The data set consists of observations from 7 bioassays plus additional control measurements (dose equal to 0).

Usage

data(TM)

Format

A data frame with 180 observations on the following 3 variables:

dose
a numeric vector.
pct
a numeric vector.
rgr
a numeric vector.

Details

dose is the concentration of herbicide. pct is the grouping variable, separating observations into curves. rgr is the response (relative growth rate).

Note

A four-parameter Gompertz model provides an acceptable fit to the data.

Source

Cedergreen N. (2004) Unpublished bioassay data.

Examples


TM[1:20,]  # displaying first 20 lines of the data set

## Fitting a Weibull model
## control measurements are specified using the 'cm' argument (not necessary to specify) 
model1 <- multdrc(rgr~dose, pct, cm="999", data=TM, fct=W1.4())
summary(model1)

rm(model1)

[Package drc version 1.3-0 Index]