“Suggested Technique for Estimation Preference Grades Proportion for Several Independent Groups by Using the Self - Consistent Criteria in Factor Analysis”. 2021. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ) 29 (1): 17-31. https://doi.org/10.55562/jrucs.v29i1.374.