CALL FARMACOV (cov, d <, phi, theta, sigma, p, q, lag>);
CALL FARMAFIT (d, phi, theta, sigma, series <, p, q, opt>);
CALL FARMALIK (lnl, series, d <, phi, theta, sigma, p, q, opt>);
CALL FARMASIM (series, d <, phi, theta, mu, sigma, n, p, q, initial, seed>);
CALL FDIF (out, series, d);