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

Table 3

GRM item parameter estimate and fit statistics for 29 of OHI.

Items content	a	b1	b2	b3	S-X^2
Q1	1.724	-1.260	0.885	2.73	70.511
Q2	1.43	-1.887	0.341	1.491	73.791
Q3	1.862	-2.738	-0.243	2.25	47.594
Q4	1.498	-1.687	0.228	2.446	49.494
Q5	2.436	-0.896	0.993	2.239	48.539
Q6	1.992	-0.7	0.917	2.189	50.641
Q7	1.846	-2.805	-0.78	2.198	41.504
Q8	2.24	-1.331	0.446	1.325	66.185
Q9	0.995	-3.176	0.126	3.108	60.153
Q10	1.11	-1.355	0.701	3.108	83.775
Q11	1.05	-1.027	1.186	2.576	98.627
Q12	0.953	-1.513	0.257	3.793	64.521
Q13	1.687	-1.978	0.424	2.393	56.818
Q14	1.73	-2.525	-0.504	1.941	38.113
Q15	1.353	-1.798	0.316	1.878	86.021
Q16	1.525	-2.26	0.164	1.702	52.78
Q17	1.087	-2.155	0.578	2.382	71.709
Q18	1.272	-1.737	-0.022	3.102	75.179
Q19	2.143	-2.404	0.146	2.097	30.131
Q20	1.87	-0.943	0.608	2.686	59.746
Q21	1.452	-1.02	0.956	2.961	88.409
Q22	1.285	-3.056	-0.744	1.682	65.058
Q23	1.348	-2.971	-0.557	2.365	62.571
Q24	1.928	-2.212	0.16	1.471	62.383
Q25	1.356	-2.567	-0.625	1.584	69.014
Q26	1.714	-1.694	0.345	2.262	53.011
Q27	1.153	-3.176	-0.517	2.332	52.344
Q28	1.236	-2.165	0.229	2.465	85.217
Q29	1.862	-2.628	0.17	1.865	46.971

Notes: value ≤0.05, a: item discrimination; b: item difficulty threshold; and S-X²: item fit values.