Description Usage Format Details Source Examples
Data consist of average body weight gain of chickens being treated with one of the two methionine sources DLM and HMTBA.
1 |
A data frame with 9 observations on the following 3 variables:
product
a factor with levels control
, DLM
and MHA
denoting the treatments
dose
a numeric vector of methionine dose
gain
a numeric vector of average body weight gain
The dataset contains a common control measurement for the two treatments. More examples using this
dataset are found under AR.2
and MM.2
.
Kratzer. D. D. and Littell, R. C. (2006) Appropriate Statistical Methods to Compare Dose Responses of Methionine Sources, Poultry Science, 85, 947–954.
1 2 3 4 5 6 7 8 9 | ## Fitting model with constraint on one parameter
met.ar.m1 <- drm(gain~dose, product, data = methionine,
fct = AR.3(), pmodels = list(~1, ~factor(product), ~factor(product)),
upperl = c(Inf, Inf, 1700, Inf, Inf))
plot(met.ar.m1, xlim=c(0,0.3), ylim=c(1450, 1800))
abline(h=1700, lty=1)
summary(met.ar.m1)
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