Extract the columns used in the formula (in order) from a PKNCAconc or PKNCAdose object.
# S3 method for PKNCAconc
model.frame(formula, ...)# S3 method for PKNCAdose
model.frame(formula, ...)
A data frame with the columns from the object in formula order.
The object to use (parameter name is formula
to use the
generic function)
Unused