drc (version 1.5-2)

methionine: Weight gain for different methionine sources

Description

Data consist of average body weight gain of chickens being treated with one of the two methionine sources DLM and HMTBA.

Usage

data(methionine)

source

Kratzer. D. D. and Littell, R. C. (2006) Appropriate Statistical Methods to Compare Dose Responses of Methionine Sources, Poultry Science, 85, 947--954.

Details

The dataset contains a common control measurement for the two treatments.

References

Schutte, J. B. and de Jong, J. (1996) Biological efficacy of DL-methinonine hydroxy analog free acid compared to DL-methionine in broiler chicks as determined by performance and breast meat yield, Agribiol. Res., 49, 74--82.

Examples

## Fitting model with constraint on one parameter 
met.m1<-drm(gain~dose, product, data=methionine, 
fct=AR.3(), pmodels = list(~1, ~factor(product), ~factor(product)), 
upperl=c(Inf, Inf,1700,Inf,Inf)) 

summary(met.m1)