Table 4 Approximate relative item information and estimated discrimination based on the 2PL GRM model
From: An item response theory evaluation of three depression assessment instruments in a clinical sample
Item | Rel. info % | Discr. | S.E(Discr.) |
|---|---|---|---|
AS-18-D1 | <5 | 0.574 | 0.188 |
AS-18-D2 | 30 | 2.845 | 0.723 |
AS-18-D3 | 5 | 0.923 | 0.220 |
AS-18-D4 | 10 | 1.256 | 0.908 |
AS-18-D5 | 15 | 1.751 | 0.274 |
AS-18-D6 | 5 | 0.861 | 0.189 |
AS-18-D7 | 10 | 1.313 | 0.331 |
AS-18-D8 | 10 | 1.102 | 0.253 |
AS-18-D9 | 15 | 1.710 | 0.416 |
PHQ9:1 | >25 | 2.425 | 0.390 |
PHQ9:2 | 10 | 1.266 | 0.593 |
PHQ9:3 | 5 | 0.918 | 0.183 |
PHQ9:4 | 10 | 1.209 | 0.216 |
PHQ9:5 | 5 | 0.704 | 0.209 |
PHQ9:6 | 15 | 1.484 | 0.426 |
PHQ9:7 | 10 | 1.245 | 0.269 |
PHQ9:8 | 5 | 0.891 | 0.173 |
PHQ9:9 | 10 | 1.150 | 0.278 |
MADRS1 | 25 | 1.927 | 0.719 |
MADRS2 | 15 | 1.425 | 0.481 |
MADRS3 | 15 | 1.175 | 0.239 |
MADRS4 | <<5 | 0.273 | 0.047 |
MADRS5 | 5 | 0.712 | 0.209 |
MADRS6 | 5 | 0.659 | 0.180 |
MADRS7 | 5 | 0.783 | 0.134 |
MADRS8 | 10 | 1.065 | 0.155 |
MADRS9 | 10 | 0.898 | 0.259 |
MADRS10 | 5 | 0.683 | 0.233 |