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- Title
How Often Do Subscores Have Added Value? Results from Operational and Simulated Data.
- Authors
Sinharay, Sandip
- Abstract
Recently, there has been an increasing level of interest in subscores for their potential diagnostic value. Haberman suggested a method based on classical test theory to determine whether subscores have added value over total scores. In this article I first provide a rich collection of results regarding when subscores were found to have added value for several operational data sets. Following that I provide results from a detailed simulation study that examines what properties subscores should possess in order to have added value. The results indicate that subscores have to satisfy strict standards of reliability and correlation to have added value. A weighted average of the subscore and the total score was found to have added value more often.
- Subjects
GRADING of students; EDUCATIONAL tests &; measurements; ESTIMATED true score; TEST theory; EXAMINATION item analysis; SCALE items
- Publication
Journal of Educational Measurement, 2010, Vol 47, Issue 2, p150
- ISSN
0022-0655
- Publication type
Article
- DOI
10.1111/j.1745-3984.2010.00106.x