TM {drc} | R Documentation |
The data set consists of observations from 7 bioassays plus additional control measurements (dose equal to 0).
data(TM)
A data frame with 180 observations on the following 3 variables:
dose is the concentration of herbicide. pct is the grouping variable, separating observations into curves. rgr is the response (relative growth rate).
A four-parameter Gompertz model provides an acceptable fit to the data.
Cedergreen N. (2004) Unpublished bioassay data.
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=w4()) summary(model1) rm(model1)