Table 4.

Summary of multidimensional models

Model	Description	p	m	χ 2	df	SRMR	RMSEA	CFI	NPD	Notes
VII	Correlated factors	27	6	6,312	299	0.055	0.078	0.858	+	Poor fit
VIII	Correlated factors, with methods factors	27	6	3,138	294	0.043	0.054	0.933		Acceptable fit by SRMR only
IX	Model VIII, drop immediate memory, delayed and recognition as 1 factor	23	4	1,672	215	0.047	0.045	0.948		Acceptable fit. Not nested within above models
X	IX, combine Set shifting and Attention, speed	23	3	1,777	220	0.047	0.046	0.945		Reasonably acceptable fit. CFI is lower than ideal.
XI	Second order factor model implied from X	23	4	2,053	225	0.049	0.049	0.935		Degraded fit relative to model X

Abbreviations: p, number of indicators; m, number of common latent variables (excluding methods factors and single indicator factors); χ² model chi-square, df, degrees of freedom; SRMR, standardized root mean square residual (≤ 0.08 satisfactory fit); RMSEA, root mean square error of approximation (< 0.05 satisfactory fit); CFI, confirmatory fit index (>0.95 satisfactory fit); NPD, non-positive definite covariance matrix for latent variables.