Table 3.

Summary statistics for the engagement scale and claims scale applying partial credit parameterization and rating scale parameterization

Scale	Model	χ 2	df	P (χ 2)	PSI	z	sd	S	K	Loc	sd
Engagement	Partial credit	65	56	0·19	0·77	0·03	1·15	0·25*	1·90*	0·72	0·99
Engagement	Rating scale	56	56	0·49	0·77	0·17	1·92	0·69*	0·79*	0·90	0·96
Claims	Partial credit	127	77	0·00	0·71	0·72	1·51	1·18	1·09	0·30	0·61
Claims	Rating scale	127	77	0·00	0·71	0·47	2·66	0·44	1·27*	0·34	0·61
Claims	Partial credit†	87	70	0·08	0·71	0·61	0·89	0·35*	1·47*	0·30	0·66
Claims	Rating scale†	106	70	0·00	0·71	0·49	1·97	0·19	1·59*	0·35	0·66
Claims	Partial credit‡	113	70	0·00	0·69	0·64	0·76	0·67*	0·76*	0·27	1·23

Table 3 refers to total item chi-square (χ ²), degrees of freedom (df), chi-square probability (P (χ ²)), person separation index (PSI), mean fit residual (z) with its standard deviation, skewness (S), kurtosis (K) and mean person location (loc) with its standard deviation.

*Negative values.

†Analyses where item 25 was deleted.

‡Analyses where items were rescored.