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	Analiza rzetelności skróconej wersji skali	Hierarchiczna omega McDonalda (ωh)
Dziedzina	Psychometria	Psychometria
Rodzina	Latent structure	Latent structure
Rok powstania	1990s–2000s	1999
Twórca	Conventional practice; codified notably by Smith, McCarthy & Anderson (2000) and Stanton et al. (2002)	Roderick P. McDonald
Typ	Scale development / psychometric evaluation	Reliability / composite score validity coefficient
Źródło pierwotne	Stanton, J. M., Sinar, E. F., Balzer, W. K. & Smith, P. C. (2002). Issues and strategies for reducing the length of self-report scales. Personnel Psychology, 55(1), 167–194.	Reise, S. P., Scheines, R., Widaman, K. F. & Haviland, M. G. (2013). Multidimensionality and structural coefficient bias in structural equation modeling: A bifactor perspective. Educational and Psychological Measurement, 73(1), 5–26.
Inne nazwy	abbreviated scale reliability, short-form validation, scale shortening, item reduction reliability	omega hierarchical, omega-h, bifactor omega, composite score validity coefficient
Pokrewne	6	5
Podsumowanie	Short-form reliability analysis evaluates whether an abbreviated version of a psychological scale maintains acceptable internal consistency, validity, and structural integrity after items are removed. It is used in survey and assessment research to create briefer instruments that reduce respondent burden without sacrificing measurement quality.	McDonald's hierarchical omega (ωh) is a coefficient derived from a bifactor confirmatory factor model that quantifies what proportion of total-score variance is attributable to a single general factor rather than to group-specific factors or item-level error. Introduced by Roderick P. McDonald (1999) and elaborated for bifactor applications by Reise and colleagues (2013) and Rodriguez and colleagues (2016), it is the primary index used in psychometrics to evaluate whether a composite total score is a defensible summary of a multidimensional scale.