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Table 9 Rasch analysis fit statistics of the two-factor model scales

From: Validation and cross-cultural adaptation of the National Eye Institute Visual Function Questionnaire (NEI VFQ-25) in Serbian patients

Scales

Items in scale

Misfitting items

Person separation reliability

Person separation index

Mean person mesure (logits)

Principal component analysis (eigenvalue 1st contrast)

Visul functioning

9

0

0.89

2.86

1.43

1.77

Socioemotional

9

2a

0.83

2.24

1.48

1.76

  1. ainfit > 1.3 (1.34, 1.38)