เปรียบเทียบวิธี

	Polytomous DIF	การวิเคราะห์ปัจจัยยืนยัน (Confirmatory Factor Analysis: CFA)
สาขาวิชา	การวัดทางจิตวิทยา	การวัดทางจิตวิทยา
ตระกูล	Latent structure	Latent structure
ปีกำเนิด	1990s–2000s	1969
ผู้ริเริ่ม	Bruno D. Zumbo and colleagues (ordinal logistic regression framework); Robert D. Ankenmann, Hariharan Swaminathan and others (IRT-based extensions)	Karl Gustav Jöreskog
ประเภท	Measurement fairness / item bias detection	Hypothesis-testing latent variable model
แหล่งต้นตำรับ	Zumbo, B. D. (1999). A handbook on the theory and methods of differential item functioning (DIF): Logistic regression modeling as a unitary framework for binary and Likert-type (ordinal) item scores. Directorate of Human Resources Research and Evaluation, Department of National Defense.	Jöreskog, K. G. (1969). A general approach to confirmatory maximum likelihood factor analysis. Psychometrika, 34(2), 183–202.
ชื่อเรียกอื่น	Polytomous DIF, DIF for polytomous items, ordinal DIF analysis, graded-response DIF	CFA, confirmatory FA, measurement model, restricted factor analysis
ที่เกี่ยวข้อง	4	4
สรุป	Polytomous differential item functioning detects whether a test or survey item with more than two ordered response categories (e.g., Likert-type scales, partial-credit items) functions differently across groups such as gender, ethnicity, or language background, after controlling for the latent trait being measured. It extends classical binary DIF methods to ordinal response formats.	Confirmatory factor analysis tests a researcher-specified factor structure against observed data. Unlike exploratory approaches, the researcher decides in advance which indicators load on which latent factor, and the model is evaluated by how closely the implied covariance matrix reproduces the sample covariance matrix. CFA is central to scale validation, construct validity assessment, and measurement invariance testing.