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Table 2 Fit statistics of two-parameter IRT models within each study

From: Pre-statistical harmonization of behavioral instruments across eight surveys and trials

Study

No. items

RMSEA

CFI

SRMR

Bifactor

ADSPlus

12

0.059

0.927

0.1

No

ACT

20

0.043

0.868

0.111

Yes

ADAMS

18

0.048

0.913

0.11

Yes

ALZQOL

25

0.033

0.952

0.123

Yes

COPE

19

0.037

0.925

0.103

Yes

NACC

23

0.069

0.753

0.123

Yes

REACH II

17

0.056

0.85

0.103

Yes

TAP

16

0

1

0.118

Yes