Const {gnm} | R Documentation |
A symbolic wrapper to specify a constant in the formula argument to
gnm
Const(const)
const |
a numeric value. |
Const
is equivalent to offset(rep(const, nObs))
where
nObs
is the number of observations being modelled.
A call to rep
used to create a variable representing the
constant in the model frame.
Heather Turner
## One way to fit the logistic function without conditional ## linearity as in ?nls library(gnm) set.seed(1) DNase1 <- subset(DNase, Run == 1) test <- gnm(density ~ -1 + Mult(1, Inv(Const(1) + Exp(Mult(1 + offset(-log(conc)), Inv(1))))), start = c(NA, 0, 1), data = DNase1, trace = TRUE) coef(test)