Measurement Invariance and Psychometric Analysis of Oxford Happiness Inventory Scale across Gender and Marital Status

Table 1

Goodness of fit statistics of different IRT models.

Model	M2	Degrees of freedom	value	RMSEA	RMSEA-5%	RMSEA-95%	TLI	CFI
GRM	1144.054	319	<0.001	0.072	0.067	0.076	0.927	0.933
GPCM	1166.433	319	<0.001	0.073	0.068	0.077	0.925	0.931
RSM	1572.113	403	<0.001	0.076	0.072	0.08	0.918	0.905

Notes: RMSEA: root mean square of error approximation; TLI: Tucker-Lewis index; CFI: comparative fit index.