Positive mental wellbeing or symptoms of depression? Discriminant validity of the Warwick-Edinburgh Mental Wellbeing Scale

Table 1 Omega coefficients and related statistics for the bifactor models – with correlated error terms

		Model 1: PHQ-9 and WEMWBS-14	Model 2: PHQ-9 and WEMWBS-7
Complete set of items	Omega _{Both factors} (ω)	0.947	0.925
	Omega H _{General factor} (ω_H)	0.802	0.854
	Relative Omega _{General factor}	0.846	0.923
	ECV _{General factor}	0.768	0.829
	H _{General factor}	0,942	0.927
	FD _{General factor}	0,961	0.958
WEMWBS items only	Omega S _{Both factors} (ω_S)	0.924	0.854
	Omega HS _{WEMWBS factor} (ω_HS)	0.345	0.315
	Relative Omega_{WEMWBS factor}	0.373	0.369
	ECV _{WEMWBS factor—new}	0,380	0.395
	H _{WEMWBS factor}	0,762	0.636
	FD _{WEMWBS factor}	0,871	0.827
% of uncontaminated correlations	PUC	0.640	0.825
Relative parameter bias	ARPB	0.177	0.106

ISSN: 1471-244X