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Table 6 Descriptive statistics for the estimated item difficulty

From: Controlling item difficulty for automatic vocabulary question generation

  P(CTT) b(IRT)
  QS. A QS. B QS. C QS. A QS. B QS. C
n 40 40 40 39 40 40
.491 .529 .419 .296 1.278 −1.720
sd .213 .228 .275 5.523 3.819 6.987
max .968 .964 .931 20 10.805 15.588
min .065 .036 .034 −15.974 −5.922 −20