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Table 3 Goodness of fit to the Rasch model for each dimension (factor)

From: Developing a dementia-specific health state classification system for a new preference-based instrument AD-5D

Dimensions

χ2 (df)

p-value

Item fit (SD)

Person fit (SD)

PSI

Interpersonal environment

37.9 (36)

0.830

0.064 (1.004)

−0.708 (1.590)

0.577

Physical health

10.9 (10)

0.358

0.666 (0.130)

−0.405 (0.749)

0.128

Self-functioning

4.1 (10)

0.941

0.015 (0.020)

−1.032 (1.310)

0.443

  1. Abbreviations: SD standard deviation, PSI person separation index