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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 %