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The Point-Biserial as a Discrimination Index for Distractors in Multiple-Choice Items: Deficiencies in Usage and an Alternative
Yigal Attali and Tamar Fraenkel
Journal of Educational Measurement
Vol. 37, No. 1 (Spring, 2000), pp. 77-86
Published by: National Council on Measurement in Education
Stable URL: http://www.jstor.org/stable/1435063
Page Count: 10
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We show that using the point-biserial as a discrimination index for distractors by differentiating between examinees who chose the distractor and examinees who did not choose the distractor is theoretically wrong and may lead to an incorrect rejection of items. We propose an alternative usage and present empirical evidence for its suitability.
Journal of Educational Measurement © 2000 National Council on Measurement in Education