Ibrahem AL-Sultany, O. and Abdulrahman Jarjies, O. 2025. Data Envelopment Analysis Models to Measure the Relative and Scale Efficiency of Educational Institutions (Tikrit University as A Model). IRAQI JOURNAL OF STATISTICAL SCIENCES. 22, 1 (May 2025), 168–180. DOI:https://doi.org/10.33899/iqjoss.2025.187791.