I am close to completing improved versions of my stochastic frontier
functions, but I am trying to get better starting values. This leads
me to the following problem. Suppose that a function is given a list
X containing the independent variables, which may or may not include
the constant (default variable no 0). How do I create a new list
X_one which consists of all of the independent variables other than
the constant?
In effect, this list is the complement of X && const, but I think
that I am missing something because I can't see an obvious way of
generating it.
Gordon