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	順序一般化可能性理論	一般化可能性理論（G理論）
分野	心理測定学	心理測定学
系統	Latent structure	Latent structure
提唱年	1963–2001	1963–1972
提唱者	Lee J. Cronbach and Robert L. Brennan	Lee J. Cronbach, Goldine Gleser, Harinder Nanda, Nageswari Rajaratnam
種類	Reliability / generalizability analysis	Variance-components reliability model
原典	Brennan, R. L. (2001). Generalizability Theory. Springer. ISBN: 978-0387952826	Cronbach, L. J., Gleser, G. C., Nanda, H. & Rajaratnam, N. (1972). The Dependability of Behavioral Measurements: Theory of Generalizability for Scores and Profiles. Wiley.
別名	Ordinal G-theory, G-theory for ordinal data, ordinal variance component analysis, G-study for ordered categorical data	G-theory, G-study / D-study framework, variance components reliability
関連	5	4
概要	Ordinal generalizability theory extends classical G-theory to the analysis of reliability and measurement error when item responses are ordered categorical (e.g., Likert-type) rather than continuous. It partitions score variance into components attributable to persons, facets, and their interactions, while accounting for the discrete, bounded nature of ordinal rating scales.	Generalizability Theory is a psychometric framework that decomposes observed score variance into multiple sources — persons, items, raters, occasions, and their interactions — using analysis of variance. It replaces the single reliability coefficient of classical test theory with a family of coefficients that tell researchers how well scores generalize across different measurement conditions.