Rating several essays
Chapters 2 and 3 were concerned with the measurement of examinees’ performances on a single item. Even though an essay written by an examinee may be much more informative about his/her ability than a multiple-choice item, a single essay is unlikely to provide sufficient information, especially in the presence of imperfect grading by the raters. Also, the examinee’s performance may be unduly affected by the essay topic, and no single topic can represent the tested domain in a balanced way.
KeywordsTrue Score Item Difficulty Discrimination Parameter Score Selection Observe Score
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