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Item distractor performance (n = 635).
| N (%) | |
|---|---|
| Frequency ≥ 5% | 474 (74.6) |
| r-PB < 0 | 561 (88.3) |
| r-PBDC < 0 | 605 (95.3) |
| Frequency ≥ 5% and r-PB < 0 | 435 (68.5) |
| Frequency ≥ 5% and r-PBDC < 0 | 465 (73.2) |
r-PB, discrimination computed with point-biserial correlations; r-PBDC, discrimination computed with the Attali and Fraenkel measure.
