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	Ordinal Rasch Model	Analisi Ordinale degli Item
Campo	Psicometria	Psicometria
Famiglia	Latent structure	Latent structure
Anno di origine	1978–1982	1950s–1980s
Ideatore	David Andrich (RSM, 1978); Geoff Masters (PCM, 1982)	Classical test theory tradition (Guilford, Nunnally, and others)
Tipo	Item response model for ordered categories	Item-level diagnostic
Fonte seminale	Andrich, D. (1978). A rating formulation for ordered response categories. Psychometrika, 43(4), 561–573.	Nunnally, J. C. & Bernstein, I. H. (1994). Psychometric Theory (3rd ed.). McGraw-Hill. ISBN: 978-0070474659
Alias	Rating Scale Model, Partial Credit Model, RSM, PCM	item analysis for ordinal data, polytomous item analysis, Likert item analysis, OIA
Correlati	6	6
Sintesi	The ordinal Rasch model extends the dichotomous Rasch framework to items with ordered response categories such as Likert-type scales. It places both persons and items on a shared interval-level metric, enabling principled measurement from ordinal data while checking whether items function consistently across all response thresholds.	Ordinal item analysis evaluates each individual item in a rating-scale or Likert-type instrument using descriptive and correlational statistics suited to ordered categorical response formats. It guides item selection and refinement by flagging items with problematic difficulty, poor discrimination, or low corrected item-total correlations before reliability and validity studies proceed.