Examples

5 Items (Effects of Item Discrimination)

No. 1, Type MC, a is 0.0050. b is 300.000, c is 0.2

No. 2, Type MC, a is 0.0100, b is 300.000, c is 0.2

No.3 Type MC, a is 0.0150, b is 300.000, c is 0.2

No. 4, Type MC, a is 0.0200, b is 300.000, c is 0.2

No. 5, Type MC, a is 0.0250, b is 300.000, c is 0.2

Response patterns (1 equals correct)

Pattern 12345: 11001, SEM is 94, SS is 280

Pattern 12345: 11100, SEM is 61, SS is 270

Pattern 12345: 01110, SEM is 46, SS is 300

Pattern 12345: 00111, SEM is 39, SS is 305

Answering more discriminating items (a-parameter) can result in higher scores.