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ERIC Number: EJ1028489
Record Type: Journal
Publication Date: 2013-Oct
Pages: 6
Abstractor: As Provided
Reference Count: N/A
ISSN: ISSN-0021-9584
Polytomous versus Dichotomous Scoring on Multiple-Choice Examinations: Development of a Rubric for Rating Partial Credit
Grunert, Megan L.; Raker, Jeffrey R.; Murphy, Kristen L.; Holme, Thomas A.
Journal of Chemical Education, v90 n10 p1310-1315 Oct 2013
The concept of assigning partial credit on multiple-choice test items is considered for items from ACS Exams. Because the items on these exams, particularly the quantitative items, use common student errors to define incorrect answers, it is possible to assign partial credits to some of these incorrect responses. To do so, however, it becomes vital that instructors reach general agreement as to the level of partial credit. Using workshops with instructors, ACS Exams has identified reasons why partial credit could be assigned in an exam set of 70 test items. With partial-credit assignments thus established, polytomous scoring is applied and the effect of such scoring on the overall norm-referenced psychometrics is determined and described. While individual students move within the overall norm, the average influence of polytomous scoring as conceived by the workshops does not substantially change the ability to do norm-based comparisons.
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A