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Table 4 Mean % of GHQ-12 items in the CAT administered items

From: An evaluation of computerized adaptive testing for general psychological distress: combining GHQ-12 and Affectometer-2 in an item bank for public mental health research

Theta estimator Item selection Prior SEM threshold θ true  ~ N(0,1) SEM threshold θ true  ~ U(-3,3)
0.25 0.32 0.40 0.45 0.50 0.25 0.32 0.40 0.45 0.50
MLE UW-FI - 19.7 23.1 24.2 24.6 23.9 20.7 21.5 25.0 25.8 24.9
MLE FP-KL - 19.5 22.9 24.0 24.1 23.8 20.6 21.2 24.4 24.9 24.4
BME UW-FI Normal 20.4 24.8 28.1 28.1 32.7 20.7 22.0 24.5 24.9 29.0
BME UW-FI Uniform 19.5 22.3 23.0 22.1 20.8 20.6 20.6 23.5 24.1 22.9
BME FP-KL Normal 20.2 25.0 28.3 28.6 32.8 20.7 22.0 24.8 25.9 30.3
BME FP-KL Uniform 19.3 22.3 22.8 21.8 20.9 20.3 20.9 23.5 23.3 22.3
EAP UW-FI Normal 20.1 23.9 26.6 27.8 28.3 20.5 21.4 23.7 24.3 26.4
EAP UW-FI Uniform 19.5 22.5 25.0 24.9 26.0 20.7 21.2 25.4 26.8 25.1
EAP FP-KL Normal 19.9 24.0 27.1 28.0 29.4 20.5 21.6 24.2 24.6 27.4
EAP FP-KL Uniform 19.7 22.1 25.2 23.3 25.8 20.2 21.3 24.8 25.4 25.3
  1. % of GHQ-12 items in the item bank: (12/52)*100 = 23.1 %