4. Which of the three models seems to best fit the data? What did you base your answer on?

EXERCISE 20.2: IRT LITERATURE SEARCH OBJECTIVE: To become familiar with applications of IRT in the literature.

Either individually or in small groups, perform a literature search to find a recent empirical article that provides an example of the application of IRT to an applied testing situation. IRT literature can be very complex, so make sure to choose an article where the primary focus is a substantive issue. Then write a brief summary and/or make a short presentation to the class summarizing the application of IRT with a focus on critiquing the use of IRT for that particular application. Focus on why the authors chose to use IRT and how IRT helped answer substantive research questions.