Table 2.

Unidimensional Modeling and Analyses

	Unidimensional Modeling								Initial Item Performance		IRT Modeling
Domain	Item pool	EFA E1/E2 ratio (criterion >4)	Percent of variance for E1 (criterion >40)	1-factor CFA loading (criterion <.50)	1-factor CFA residual correlation (criterion >.20)	1-factor CFA modification index (criterion >100)	Item-adjusted total score correlations (Criterion <.40)	Sparse cells (criterion<10)	Problems with monotonicity	IRT item misfit	Ll_ Q	Interim/Final item bank
Caregiver Feelings of Loss-Self	43 items	--	--	0 items	0 items	0 item	0 items	0 items	0 items	13 items	0 items	30 items
Caregiver Feelings of Loss-Person with TBI	20 items	--	--	0 items	0 items	1 item	0 items	0 items	0 items	0 items	0 items	19 items

Note. CFA = Confirmatory Factor Analysis; EFA = Exploratory Factor Analysis; IRT = Item Response Theory