Categories English Item difficulty in IRT is the ability at which the probability of successes on the item is Post author By esimpk Post date December 9, 2021 A: 0.5 B: 0.10 C: 0.6 D: 1.0 ← The G theory provides a framework for conceptualizing, investigating and designing → A conditions when an item functions differently for respondents from one group to another , for controlling for differences between the groups on underlying trait is called