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Table 3 Rasch model for the 23-item UJA Alzheimer’s care scale

From: Measuring knowledge of Alzheimer’s: development and psychometric testing of the UJA Alzheimer’s Care Scale

Items Difficulty (Standard error) WMS (infit) UMS (outfit)
1 0.84 (0.09) 1.07 1.12
2 1.36 (0.09) 1.04 1.02
3 0.54 (0.09) 1.12 1.22
4 0.94 (0.09) 0.97 0.98
5 −0.62 (0.11) 1.00 0.88
6 0.02 (0.10) 1.08 1.03
7 0.28 (0.09) 1.02 1.01
8 1.42 (0.09) 1.07 1.20
9 −1.29 (0.14) 0.90 0.70
10 1.35 (0.14) 0.90 0.79
11 −0.61 (0.11) 0.99 1.25
12 0.47 (0.09) 1.05 1.09
13 1.41 (0.09) 0.99 1.00
14 −2.12 (0.19) 1.00 0.92
15 1.83 (0.09) 0.96 1.02
16 −1.73 (0.17) 0.95 0.74
17 −1.13 (0.13) 0.99 1.10
18 0.88 (0.09) 1.06 1.02
19 −1.65 (0.16) 0.95 0.95
20 1.22 (0.09) 0.94 0.90
21 −1.74 (0.17) 0.95 0.68
22 −1.39 (0.15) 0.90 0.72
23 2.43 (0.10) 1.01 1.12
  1. Estimated using the joint maximum likelihood method. WMS: weighted mean square of standardized residuals (infit). UMS: unweighted mean square of standardized residuals (outfit). Values from 0.80 to 1.20 indicate a good fit to the model