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Table 3 Difficulty and discrimination power of items in version A of the TDE-II

From: Development of the Arithmetic Subtest of the School Achievement Test-Second Edition

Items Difficulty Discrimination Items Difficulty Discrimination
A2 −3.3375 1.5039 A28 −0.6929 3.4331
A7 −3.2336 1.6934 A36 −0.6369 3.6589
A18 −2.7796 2.4006 A33 −0.4758 5.27
A13 −2.7351 1.9641 A27 −0.4697 4.9345
A9 −2.3072 3.113 A37 −0.4043 3.9365
A3 −2.1235 2.0514 A39 −0.3681 4.4655
A15 −2.0947 2.5557 A31 −0.3645 8.5817
A10 −1.9997 4.0321 A53 0.1308 3.4349
A16 −1.8 2.2701 A44 0.2164 3.5976
A17 −1.7922 3.2982 A54 0.3288 3.3836
A14 −1.6235 2.7877 A58 0.5078 4.0837
A19 −1.5748 3.1029 A50 0.5188 3.151
A20 −1.4458 5.147 A59 0.5835 4.5851
A22 −1.415 2.5523 A52 0.6275 3.8564
A23 −1.1939 2.9703 A56 0.7888 3.2923
A26 −1.0552 5.0518 A63 0.8019 4.596
A24 −0.9618 4.2261 A57 0.8577 4.4113
A30 −0.8141 3.8369 A55 0.922 2.2936
A32 −0.7083 3.2816