Spatio-temporal Rasch analysis of quality of life outcomes in the French general population. Measurement invariance and group comparisons

Table 2 Fit tests for the modelling of each dimension by a Partial Credit Model (PCM) with the complete sample or with a sample fixed to 500

	Non parametric IRT analysis				Fit of a PCM for the complete sample (n=26388)			Fit of a PCM for a fixed, moderate sample size (n=500)
	H	Min(H_j)	Min(H_jk)	Max(Crit_M)	χ²	df	P	χ²	df	p
General Health	0.49*	0.40*	0.31*	−5	1320.42	81	<0.0001	39.36	81	0.99
Physical Functioning	0.76*	0.72*	0.66*	−21	3895.46	94	<0.0001	103.64	94	0.23
Mental Health	0.57*	0.50*	0.33*	−10	2808.10	81	<0.0001	55.95	81	0.98

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