  The use of reparameterization in the maximization of the likelihood function
of the MA(q) model is discussed. A general method for testing for the presence
of a parameter estimate on the boundary of an MA(q) model is presented. This
test is illustrated with a brief simulation experiment for the MA(q) for
q=1,2,3,4 in which it is shown that the probability of an estimate being on the
boundary increases with q.
