手法を比較

	部分評点モデル（PCM / GPCM）	ラッシュモデル
分野	心理測定学	心理測定学
系統	Latent structure	Latent structure
提唱年	1982	1960
提唱者	Geoff N. Masters (PCM, 1982); Eiji Muraki (GPCM, 1992)	Georg Rasch
種類	Item Response Theory / Polytomous IRT	Item Response Theory / Latent trait model
原典	Masters, G. N. (1982). A Rasch model for partial credit scoring. Psychometrika, 47(2), 149–174.	Rasch, G. (1960). Probabilistic Models for Some Intelligence and Attainment Tests. Danish Institute for Educational Research, Copenhagen.
別名	Kısmi Kredi Modeli (PCM / GPCM), Generalized Partial Credit Model, GPCM, PCM	1PL IRT, one-parameter logistic model, Rasch Modeli — 1PL IRT, 1PL model
関連	5	6
概要	The Partial Credit Model is an extension of the Rasch measurement framework designed for ordered polytomous items — items whose responses fall into more than two ordered categories, such as partial-credit tasks in performance assessment or open-ended scoring rubrics. Proposed by Geoff Masters in 1982 and later generalised by Eiji Muraki in 1992, the model estimates a separate threshold (step) parameter for each adjacent-category transition within every item, allowing fine-grained calibration of how much each additional credit level contributes to locating a person on the latent trait.	The Rasch model, introduced by Georg Rasch in 1960, is the simplest member of the Item Response Theory (IRT) family. It assigns a single difficulty parameter to each test item and places both item difficulties and person abilities on the same logit scale, enabling direct, sample-independent comparison of items and persons.