Table 2.

D-study results for the five domains and the overall scale for P ^• × I ^∘ design based on original test length

Index	PWB (n′i = 7)	SWB (n′i = 7)	EWB (n′i = 6)	FWB (n′i = 7)	LEUS (n′i = 17)	Overall scalea (n′i = 44)
σ 2 P	0.642	0.343	0.491	0.679	0.327	0.323
σ 2 δ	0.095	0.077	0.158	0.125	0.056	0.019
σ 2 Δ	0.114	0.086	0.197	0.146	0.084	0.025
${{\sigma }^2}_{X_{\mathit{PI}}}$	0.026	0.012	0.045	0.029	0.032	0.009
G	0.871	0.816	0.756	0.845	0.854	0.945
Ф	0.849	0.800	0.714	0.823	0.796	0.928

σ ² _PUniverse score variance, σ ² _δ Relative error variance, σ ² _Δ Absolute error variance, ${{\sigma }^2}_{X_{\mathit{PI}}}$ Error variance for mean, G generalizability coefficient, Ф index of dependability

^a For the overall scale, all indexes are the corresponding composite values