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Table 3 BAQ tests sorted into 5 classes or groups showing their distractor efficiency

From: How important is distractor efficiency for grading Best Answer Questions?

Test A
n
A
DE
(%)
B
n
B
DE
(%)
C
n
C
DE
(%)
D
n
D
DE
(%)
E
n
E
DE
(%)
Mean
DE
(%)
1 2 62.5 19 57.89 13 48.08 10 37.5 6 66.67 52.5
2 1 50 24 64.58 10 47.5 13 17.31 2 75 49
3 1 75 16 65.63 13 51.92 15 23.33 5 55 48.5
4 1 50 12 56.25 8 53.13 18 52.78 11 40.91 54
5 1 75 17 48.53 5 65 8 34.38 19 34.21 43
6 2 62.5 19 57.89 6 37.5 17 33.82 6 12.5 43
7 1 66.66 15 62.22 6 55.55 9 66.66 19 28.07 49.33
Mean   63.09   59   44.1   37.97   44.62  
  1. Class of items: A = excellent, B = good, C = acceptable, D = remediable, E = discarded
  2. DE distractor efficiency in percentage,number of items, classes A, B and C were banked, D put in remediable category and E discarded