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Table 4 Correlation of DIFi with FDs/item and DISi with FDs/item of 350 BAQ items

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

  DIFi - FD DISi - FD
Pearson correlation r − 0.66 (Sig. 0.000) 0.317 (Sig. 0.000)
Spearman’s rho − 0.705 (Sig. 0.000) 0.347 (Sig. 000)
  1. Correlation is significant at the 0.01 level (2-tailed)
  2. DIFi difficulty index; DISi discrimination index; FD  functional distractors per item