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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 Included1753
n Removed0
 Measure (logits)1.15 ± 1.10
 Infit MnSq1.05 ± 0.64
 Outfit MnSq1.04 ± 1.01
 Separation2.66
 Reliability0.88
Item
n Included19
n Removed0
 Measure (logits)0.00 ± 0.79
 Infit MnSq1.08 ± 0.47
 Outfit MnSq1.02 ± 0.47
 Separation24.43
 Reliability1
 Principal component analysis (eigenvalue in first contrast)3.3