
logistic(lowerc = c(-Inf, -Inf, -Inf, -Inf, -Inf),
upperc = c(Inf, Inf, Inf, Inf, Inf), fixed = c(NA, NA, NA, NA, NA),
names = c("b", "c", "d", "e", "f"), scaleDose = TRUE, useDer = FALSE)
l3
, l4
and l5
.## A four-parameter logistic model with b fixed at 1
model1 <- multdrc(FA, fct=logistic(fixed=c(1, NA, NA, NA, 1)))
summary(model1)
## Can also be specified using the function 'l4(fixed=c(1,NA,NA,NA))'
## A four-parameter logistic model with the constraint b>3
model2 <- multdrc(FA, fct=logistic(fixed=c(NA, NA, NA, NA, 1),
lowerc=c(3, -Inf, -Inf, -Inf, -Inf)), control=mdControl(constr=TRUE))
summary(model2)
rm(model1, model2)
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