NotesFAQContact Us
Collection
Advanced
Search Tips
Peer reviewed Peer reviewed
PDF on ERIC Download full text
ERIC Number: EJ1111306
Record Type: Journal
Publication Date: 2008-Dec
Pages: 16
Abstractor: As Provided
Reference Count: 3
ISBN: N/A
ISSN: EISSN-2330-8516
Subscores and Validity. Research Report. ETS RR-08-64
Haberman, Shelby J.
ETS Research Report Series, Dec 2008
In educational testing, subscores may be provided based on a portion of the items from a larger test. One consideration in evaluation of such subscores is their ability to predict a criterion score. Two limitations on prediction exist. The first, which is well known, is that the coefficient of determination for linear prediction of the criterion score by the subscore cannot exceed the reliability coefficient of the subscore. The second limitation is on incremental validity. The coefficient of determination for linear prediction of the criterion score by both the total score and the subscore is at least as great as the coefficient of determination for linear prediction of the criterion score by only the total score. Incremental validity may be measured by the difference between these two coefficients of determination. This difference is no greater than the reliability of the residual from linear prediction of the subscore by the total score.
Educational Testing Service. Rosedale Road, MS19-R Princeton, NJ 08541. Tel: 609-921-9000; Fax: 609-734-5410; e-mail: RDweb@ets.org; Web site: https://www.ets.org/research/policy_research_reports/ets
Publication Type: Journal Articles; Reports - Research
Education Level: High Schools; Secondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A