Ibraheem, Omar, and Mohammed Jasim Mohammed. “Use the Robust RFCH Method With a Polychoric Correlation Matrix in Structural Equation Modeling When You Are Ordinal Data”. IRAQI JOURNAL OF STATISTICAL SCIENCES 19, no. 2 (December 1, 2022): 24–35. Accessed September 6, 2025. https://tanmiyat.uomosul.edu.iq/index.php/stats/article/view/29341.