Table 3.

Summary of single factor domain-specific models

Model	Domain	p	ω	χ 2	df	SRMR	RMSEA	CFI	NRV	Notes
I	Orientation	2	NAa	0	0	0.000	0.000	1.000	+	Redundant indicators; retain MMSE orientation as single indicator
IIA	Memory, immediate	4	0.76	36	2	0.021	0.071	0.981		Poor RMSEA, retain as final model
IIB	Memory, delayed	5	0.85	44	5	0.018	0.048	0.985		Retain as final model
IIC	Memory, recognition	2	0.65	0	0	0.000	0.000	1.000		No identified issues other than only 2 indicators
III	Set shifting	3	0.81	0	0	0.000	0.000	1.000		No identified issues other than only 3 indicators
IV	Attention, speed	5	0.87	126	5	0.020	0.085	0.974		Poor RMSEA, retain as final model
V	Language, fluency	6	0.82	44	9	0.051	0.034	0.978		Retain as final model
VI	Visuospatial	2	NAa	0	0	0.000	0.000	1.000	+	Redundant indicators; retain CERAD constructional praxis as single indicator
IID	Memory, delayed & recognition	7	0.89	147	12	0.023	0.058	0.979		Adopted after fitting multidimensional models
IIIA	Executive functioning (Set shifting & Attention, speed)	8	0.94	766	20	0.038	0.106	0.916		Considered after fitting multidimensional models

Abbreviations: p, number of indicators, ω, MacDonald’s omega; χ² model chi-square, df, degrees of freedom; SRMR, standardized root mean square residual (≤ 0.08 satisfactory for); RMSEA, root mean square error of approximation (< 0.05 satisfactory fit); CFI, confirmatory fit index (>0.95 satisfactory fit); NRV, negative residual variance; MMSE, Mini-Mental State Examination; CERAD, Consortium to Establish a Registry for Alzheimer’s Disease.

^aOmega estimate greater than 1.0, an out-of-bounds estimate due to negative residual variance.