Abdullahi, . A. A.; Kazeem, . E. L.; Abbas, . U. F.; Hassan, . M. ROBUST ORDER IDENTIFICATION OF ARIMA AND GARCH MODELS: STATIONARY AND NON-STATIONARY PROCESS. FJS 2023, 7 (3), 10-15. https://doi.org/10.33003/fjs-2023-0703-1847.