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Table 3 Item locations as estimated by the 2PL GRM

From: An item response theory evaluation of three depression assessment instruments in a clinical sample

Item Item location Corrected location to person mean = 0 S.E.
AS-18-D1 0.902 0.766 0.354
AS-18-D2 0.096 −0.039 0.164
AS-18-D3 0.677 0.541 0.324
AS-18-D4 0.479 0.344 0.182
AS-18-D5 0.299 0.164 0.221
AS-18-D6 −0.134 −0.270 0.303
AS-18-D7 0.241 0.106 0.187
AS-18-D8 0.635 0.499 0.276
AS-18-D9 1.542 1.406 0.239
PHQ9:1 0.055 −0.013 0.189
PHQ9:2 −0.094 −0.162 0.168
PHQ9:3 −0.266 −0.334 0.244
PHQ9:4 −0.114 −0.182 0.221
PHQ9:5 0.551 0.483 0.284
PHQ9:6 0.067 −0.001 0.174
PHQ9:7 −0.393 −0.461 0.225
PHQ9:8 0.728 0.660 0.273
PHQ9:9 1.417 1.349 0.263
MADRS1 0.160 0.133 0.198
MADRS2 0.588 0.561 0.222
MADRS3 −0.252 −0.279 0.284
MADRS4 1.832 1.805 1.372
MADRS5 1.161 1.134 0.361
MADRS6 −0.582 −0.609 0.314
MADRS7 0.641 0.614 0.439
MADRS8 0.052 0.025 0.409
MADRS9 −0.178 −0.205 0.247
MADRS10 1.197 1.170 0.309