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Educational and Psychological Measurement
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An Empirical Demonstration of the Stability of the Maximized Correlation as an Internal-Consistency Reliability Estimate for Tests of Small Item Size

Edwin E. Wagner

Forest Institute

Holiday E. Adair

The University of Akron

Ralph A. Alexander

The University of Akron

Heterogeneity and negative skew often result in an underestimate of internal reliability when the usual split-half or alpha coefficients are computed for tests with a small number of items. A maximized correlation, although it may be positively biased, appears to be a more rational alternative. It was shown that r max is a stable statistic as well as a higher estimate of test reliability than alpha or r1l. Its use as a standard procedure was recommended.

Educational and Psychological Measurement, Vol. 50, No. 3, 539-544 (1990)
DOI: 10.1177/0013164490503007
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