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An Analytical Procedure for the Equipercentile Method of Equating Tests

Carl A. Lindsay and Mark A. Prichard
Journal of Educational Measurement
Vol. 8, No. 3 (Autumn, 1971), pp. 203-207
Stable URL: http://www.jstor.org/stable/1434391
Page Count: 5
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An Analytical Procedure for the Equipercentile Method of Equating Tests
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Abstract

Prior use of the equipercentile method of test equating was based on a graphic procedure which is tedious, subject to smoothing errors, and nonanalytical. Recognition of the equipercentile method as a curve-fitting procedure for two cumulative percentage distributions leads to a proposed analytical solution to the problem through use of linear estimates for successive "missing" cumulative percentage points. A complete equipercentile procedure which uses the proposed method and provides linear and quadratic functions for goodness-of-fit and extrapolation is discussed and illustrated with data from a test equating project.

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