Conclusion
Goal programming was used to calculate ARMA model coefficients.Results for the Karun River proved that the method is accurate and efficient enough for this purpose. The main
disadvantage of the GP method is the high computational cost especially for a large number of model parameters. This negative aspect may be mitigated somewhat by using efficient optimization algorithms to reduce the computational time. With the rapid advances in computer technology,
however, it is expected that significant reductions in this constraint will be realized making it more and more feasible to test these new methods. Since this technique is in its preliminary phase, the numbers of AR and MA parameters are manually selected by the user. The next step will be the optimizing of these model parameters using integer programming.