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	दो-पैरामीटर लॉजिस्टिक आईआरटी मॉडल (2PL)	अन्वेषणात्मक कारक विश्लेषण (EFA)
क्षेत्र	मनोमिति	सांख्यिकी
परिवार	Latent structure	Latent structure
उद्भव वर्ष	1980	—
प्रवर्तक	Frederic M. Lord	—
प्रकार	Item response model / latent trait model	Latent variable / dimension reduction
मौलिक स्रोत	Lord, F. M. (1980). Applications of Item Response Theory to Practical Testing Problems. Erlbaum.	Fabrigar, L. R., Wegener, D. T., MacCallum, R. C. & Strahan, E. J. (1999). Evaluating the use of exploratory factor analysis in psychological research. Psychological Methods, 4(3), 272–299.
उपनाम	two-parameter logistic model, 2PL model, 2PL IRT — İki Parametreli Madde Tepki Modeli	common factor analysis, açımlayıcı faktör analizi, factor analysis
संबंधित	6	4
सारांश	The two-parameter logistic item response model, formalised by Frederic Lord (1980), describes the probability that a respondent answers a binary test item correctly as a smooth S-shaped function of the respondent's latent ability. By estimating a separate discrimination parameter for each item alongside a difficulty parameter, 2PL allows items to differ in how sharply they distinguish high- from low-ability respondents — making it the standard model for large-scale educational and psychological assessments.	Exploratory factor analysis reduces a large set of observed variables into a smaller number of latent common factors. It is widely used in scale development and psychometrics to uncover the dimensional structure that underlies a set of correlated items, without specifying that structure in advance.