手法を比較

	ショートフォーム項目分析	項目応答理論 (IRT)
分野	心理測定学	心理測定学
系統	Latent structure	Latent structure
提唱年	1990s–2000s	1952–1968
提唱者	Psychometric tradition; methodological articulation by Smith, McCarthy & Anderson (2000)	Frederic M. Lord (and Allan Birnbaum for the 2PL/3PL models)
種類	Item selection and evaluation procedure	Probabilistic measurement model
原典	Smith, G. T., McCarthy, D. M., & Anderson, K. G. (2000). On the sins of short-form development. Psychological Assessment, 12(1), 102–111.	Lord, F. M. & Novick, M. R. (1968). Statistical Theories of Mental Test Scores. Addison-Wesley.
別名	abbreviated scale item analysis, short-scale item evaluation, item screening for short forms, SFIA	IRT, latent trait theory, item characteristic curve theory, modern test theory
関連	4	5
概要	Short-form item analysis is the systematic psychometric evaluation and selection of items when constructing an abbreviated version of a longer measurement instrument. It applies classical and modern item-analysis criteria — item-total correlations, reliability estimates, and factor structure — to identify the smallest item subset that preserves the original scale's psychometric integrity.	Item response theory models the probability that a respondent answers an item correctly (or endorses it) as a function of the respondent's latent trait level and the item's own statistical properties — difficulty, discrimination, and guessing. Unlike classical test theory, IRT places persons and items on the same scale, yielding measurement that is sample-independent for items and test-independent for persons.