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Table 4 Overall outcomes of the Rasch analysis of the VFS-Plus instrument in our sample

From: Validation of a vision-related activity scale for patients with retinitis pigmentosa

Parameters

 

Person

n Included

1753

n Removed

0

 Measure (logits)

1.15 ± 1.10

 Infit MnSq

1.05 ± 0.64

 Outfit MnSq

1.04 ± 1.01

 Separation

2.66

 Reliability

0.88

Item

n Included

19

n Removed

0

 Measure (logits)

0.00 ± 0.79

 Infit MnSq

1.08 ± 0.47

 Outfit MnSq

1.02 ± 0.47

 Separation

24.43

 Reliability

1

 Principal component analysis (eigenvalue in first contrast)

3.3