In item response theory analyses, the item characteristic called the difficulty threshold represents
A) the level of ability at which a test taker has a 50% likelihood of endorsing the item.
B) the internal consistency of the measure.
C) how well an item distinguishes between people who are high and low on the trait being assessed.
D) the structural validity of the measure.

Question

Quizplus · Accepted Answer

The difficulty threshold represents the level of ability at which a test taker has a 50% likelihood of endorsing the item. This is a key item characteristic in item response theory, as it informs the interpretation of item difficulty and helps to define the measurement scale.

In Item Response Theory Analyses, the Item Characteristic Called the Difficulty