Abdullahi AA, Kazeem EL, Abbas UF, Hassan M. ROBUST ORDER IDENTIFICATION OF ARIMA AND GARCH MODELS: STATIONARY AND NON-STATIONARY PROCESS. FJS [Internet]. 2023 Jul. 7 [cited 2025 Oct. 29];7(3):10-5. Available from: http://www.fjsadmin.fudutsinma.edu.ng/index.php/fjs/article/view/1847