ABSTRACT
Because the trends are usually fairly s low and stable, a simple
deterministic formula w i l l often be adequate for in t roducing the
relevant effect into the model . Th is w i l l be assumed to be the case.
Because the trends are usually fairly s low and stable, a simple
deterministic formula w i l l often be adequate for in t roducing the
relevant effect into the model . Th is w i l l be assumed to be the case.