From: Do item-writing flaws reduce examinations psychometric quality?
Flaw areas | Number of items N (%) | Difficulty Index Mean (SD) | Discrimination Mean (SD) |
---|---|---|---|
Standarda | 354 (45.8) | 0.65 (0.21) | 0.36 (0.17) |
Content concernsb | 56 (7.2) | 0.63 (0.18) | 0.36 (0.16) |
Content concerns without rule 4b | 12 (1.6) | 0.61 (0.22) | 0.25 (0.15) |
Style concernsb | 47 (6.1) | 0.62 (0.20) | 0.35 (0.14) |
Writing the stemb | 150 (19.4) | 0.59 (0.19) | 0.31 (0.14) |
Writing the choicesb | 166 (21.5) | 0.60 (0.21) | 0.33 (0.15) |