TABLE 9.

Results of the discriminant validity test and common method variance test.

Model	χ2/df	CFI	GFI	RMSEA	SRMR
3-factor (KS; TA; PDA)	3.16	0.95	0.90	0.078	0.039
2-factor (KS; TA + PDA)	7.45	0.84	0.72	0.135	0.063
2-factor (KS + PDA; TA)	7.18	0.85	0.72	0.132	0.058
2-factor (KS + TA; PDA)	6.75	0.86	0.74	0.127	0.053
1-factor (KS + TA + PDA)	8.70	0.81	0.68	0.147	0.068

KS, knowledge structure; TA, teaching ability; PDA, professional development agency.