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Journal of Learning Disabilities
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A Cost Analysis Approach to Optimizing Test Selection

Cathy L.W. Wendler, MS

Cathy L. W. Wendler is a psychologist at Western Psychological Services, Los Angeles. She received her MS in educational psychology from Purdue University and is currently a doctoral candidate at UCLA

Gale H. Roid, PhD

Gale H. Roid is director of research at Western Psychological Services. He received his PhD in psychology/psychometrics at the University of Oregon. Address: Ms. Wendler, Western Psychological Services, 12031 Wilshire Boulevard, Los Angeles, CA 90025.

The problem of choosing the best combination of educational and psychological tests for use in identifying students with learning disabilities is discussed within a cost-efficiency framework. An efficiency index for estimating the classification accuracy of tests, easily determined from local data samples and base-rate information, is presented as a key component of the cost-effectiveness (CE) model. A review of the literature on cost-effectiveness analysis suggests the use of expert judgment in addition to a strictly quantitative CE ratio. The use of the efficiency index, the judgmental approach, and the CE ratio is demonstrated with a numerical example.

Journal of Learning Disabilities, Vol. 17, No. 7, 400-405 (1984)
DOI: 10.1177/002221948401700704
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This article has been cited by other articles:


Home page
 J Learn DisabilHome page
J. D. Christopher, R. Giuliani, C. S. Holte, A. L Beaman, and G. C. Camp
Predictor Variables Related to the Classification of Learning Disabilities
J Learn Disabil, November 1, 1989; 22(9): 588 - 589.
[Abstract] [PDF]