Confronta i metodi

	Omega gerarchico di McDonald (ωh)	Confirmatory factor analysis
Campo	Psicometria	Psicometria
Famiglia	Latent structure	Latent structure
Anno di origine	1999	1969
Ideatore	Roderick P. McDonald	Karl Gustav Jöreskog
Tipo	Reliability / composite score validity coefficient	Hypothesis-testing latent variable model
Fonte seminale	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.	Jöreskog, K. G. (1969). A general approach to confirmatory maximum likelihood factor analysis. Psychometrika, 34(2), 183–202.
Alias	omega hierarchical, omega-h, bifactor omega, composite score validity coefficient	CFA, confirmatory FA, measurement model, restricted factor analysis
Correlati	5	4
Sintesi	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.	Confirmatory factor analysis tests a researcher-specified factor structure against observed data. Unlike exploratory approaches, the researcher decides in advance which indicators load on which latent factor, and the model is evaluated by how closely the implied covariance matrix reproduces the sample covariance matrix. CFA is central to scale validation, construct validity assessment, and measurement invariance testing.