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Applied Psychological Measurement
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Determining the Length of a Criterion-Referenced Test

Rand R. Wilcox

University of California, Los Angeles

When determining how many items to include on a criterion-referenced test, practitioners must re solve various nonstatistical issues before a par ticular solution can be applied. A fundamental problem is deciding which of three true scores should be used. The first is based on the prob ability that an examinee is correct on a "typical" test item. The second is the probability of having acquired a typical skill among a domain of skills, and the third is based on latent trait models. Once a particular true score is settled upon, there are several perspectives that might be used to de termine test length. The paper reviews and critiques these solutions. Some new results are described that apply when latent structure models are used to esti mate an examinee's true score.

Applied Psychological Measurement, Vol. 4, No. 4, 425-446 (1980)
DOI: 10.1177/014662168000400402
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This article has been cited by other articles:


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R. R. Wilcox
Estimating the Validity of a Multiple-Choice Test Item Having k Correct Alternatives
Applied Psychological Measurement, September 1, 1985; 9(3): 311 - 316.
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Determining the Lenqth of Multiple Choice Criterion-Referenced Tests when an Answer-Until-Correct Scoring Procedure is Used
Educational and Psychological Measurement, September 1, 1982; 42(3): 789 - 794.
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 Applied Psychological MeasurementHome page
R. R. Wilcox
Solving Measurement Problems with an Answer-Until-Correct Scoring Procedure
Applied Psychological Measurement, July 1, 1981; 5(3): 399 - 414.
[Abstract]

Home page
 Educational and Psychological MeasurementHome page
R. R. Wilcox
The Single Administration Estimate of the Proportion of Agreement of a Proficiency Test Scored with a Latent Structure Model
Educational and Psychological Measurement, July 1, 1981; 41(2): 389 - 400.
[Abstract]

Home page
 Applied Psychological MeasurementHome page
R. Wilcox
Book Review : Criterion-Referenced Measurement: The State of the Art: R. A. Berk, Ed. Baltimore: The Johns Hopkins University Press, 1980, 234 pp
Applied Psychological Measurement, January 1, 1981; 5(1): 133 - 135.