ROBUST PARAMETER ESTIMATION FOR RANDOM EFFECT PANEL DATA MODEL IN THE PRESENCE OF HETEROSCEDASTICITY AND INFLUENTIAL OBSERVATIONS. FJS [Internet]. 2021 Nov. 2 [cited 2025 Sep. 12];5(3):93-100. Available from: http://www.fjsadmin.fudutsinma.edu.ng/index.php/fjs/article/view/746