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three-parameter IRT model indicates which three item characteristics? a. Discrimination, readability, difficulty b. Difficulty, unique contribution...

three-parameter IRT model indicates which three item characteristics? a. Discrimination, readability, difficulty b. Difficulty, unique contribution to the toal score, discrimination c. Difficulty, chance of guessing correctly, discrimination d. Reliability, unique contribution to the total score, validity

Social-Sciences   Psychology   
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Answer #1

The correct Option is C).

Item Response Theory focusses on analysis of how individual items will determine the construct being measured. There are various models depending on the number of dimensions considered.

The three parameter model analyzes an item on

  • Item Difficulty is percentage of test takers who answered the item correctly.
  • Discrimination is the ability of an item to discriminate between good and poor performers.
  • chances of being guessed correctly
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