Al-Zawbaee, O.M. and Mahmood, N.H. 2023. Building an Efficient Model by Using Panel Data. Cihan University-Erbil Journal of Humanities and Social Sciences. 7, 1 (Mar. 2023), 82–87. DOI:https://doi.org/10.24086/cuejhss.v7n1y2023.pp82-87.