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Table 6 Rasch Analysis of Computer Adaptive Testing item sets

From: The Valued Life Activities Scale (VLAs): linguistic validation, cultural adaptation and psychometric testing in people with rheumatic and musculoskeletal diseases in the UK

Analysis Item Sets and samples Chi- Squarea Df P Residual
Item
Residual
Person
PSI
Reliability
% tests >5% 95%LCI N
      SD SD     
1 Core Set- CAT15 Sample 1 153.0 135 0.138 1.586 0.967 0.87 6.8 4.7 500
2 Core Set- CAT15 Sample 2 172.5 135 0.016 1.711 0.934 0.88 6.6 4.5 500
3 Core Set- CAT15 Sample 3 165.2 135 0.040 1.576 0.880 0.88 5.1 3.0 500
4 Second Set- CAT10 Sample 1 106.6 90 0.112 1.314 0.927 0.84 5.6 3.2 500
5 Second Set- CAT10 Sample 2 114.2 90 0.043 1.694 0.993 0.85 3.6 1.1 500
6 Second Set- CAT10 Sample 3 106.6 90 0.112 1.498 1.021 0.86 5.2 3.0 500
  Ideal Values   >0.05a   <1.4 <1.4 >0.70 <5.0 <5.0  
  1. aBonferroni Adjusted (0.008 for 6 tests)