Quantifying Liver-Stomach Disharmony Pattern of Functional Dyspepsia Using Multidimensional Analysis Methods

Table 7

Estimation of MIRT parameters of the items of the scale.

Items	MIRT parameters
	a1	a2	a3	d1	d2	d3	MDISC	MDIFF
Item 1	1.73	0.00	0.00	0.00	−3.15	−5.33	1.73	0.00
Item 2	3.88	0.00	0.00	1.45	−5.02	−9.46	3.88	−0.37
Item 3	0.81	0.00	0.00	−2.08	−4.28	−5.82	0.81	2.58
Item 4	0.96	0.00	0.00	−0.47	−2.07	−4.52	0.96	0.48
Item 5	0.45	0.00	0.00	−0.41	−2.45	−4.35	0.45	0.91
Item 6	0.00	2.06	0.00	0.14	−2.14	−7.50	2.06	−0.07
Item 7	0.00	2.10	0.00	0.47	−1.84	−8.30	2.10	−0.23
Item 8	0.00	4.52	0.00	2.37	−3.29	−13.60	4.52	−0.52
Item 9	0.00	0.00	1.38	−0.56	−1.92	−5.98	1.38	0.41
Item 10	0.00	0.00	2.33	−0.45	−4.96	−6.75	2.33	0.20
Item 11	0.00	0.00	3.13	−2.84	−7.27	−9.18	3.13	0.91
Item 12	0.00	0.00	1.35	−2.62	−4.99	−7.09	1.35	1.94

MIRT: multidimensional item response theory; ai: discrimination parameter of dimension i; dj: easiness parameter of category j of an item; MDISC: multidimensional discrimination index; MDIFF: multidimensional difficulty index.