drc (version 1.0-3)

daphnids: Daphnia test

Description

The number of immobile daphnids --in contrast to mobile daphnids-- out of a total of 20 daphnids was counted for several concentrations of a toxic substance.

Usage

data(daphnids)

source

Nina Cedergreen, Royal Veterinary and Agricultural University, Denmark.

Details

The same daphnids were counted at 24h and later again at 48h.

Examples

## Fitting a model with different parameters
##  for different curves
model1.daphnids <- multdrc(no/total~dose, time, weights=total, 
data=daphnids, fct=l2(), type="binomial")


## Goodness-of-fit test
anova(model1.daphnids)


## Fitting a model with a common intercept parameter
model2.daphnids <- multdrc(no/total~dose, time, weights=total, 
data=daphnids, fct=l2(), type="binomial", 
collapse=list(~1, ~time))


rm(model1.daphnids, model2.daphnids)