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Appropriate Sample Size for Comparing Alpha Reliabilities.
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Feldt, Leonard S.; Ankenmann, Robert D. – Applied Psychological Measurement, 1998
Developed a graphical method of determining adequate sample size based on the power of L. Feldt's (1969) test of the difference between two values of Cronbach's alpha coefficient. Discusses assumptions on which this approach is based. (SLD)
Descriptors: Comparative Analysis, Reliability, Sample Size
Testing the Difference between Two Alpha Coefficients with Small Samples of Subjects and Raters
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Feldt, Leonard S.; Kim, Seonghoon – Educational and Psychological Measurement, 2006
Researchers sometimes need a statistical test of the hypothesis that two values of Cronbach's alpha reliability coefficient are equal. The situation may involve scores from two different measures administered to independent random samples or from the same measure administered to random samples from two different populations. Feldt derived a test…
Descriptors: Individual Testing, Test Items, Sample Size, Scores
A Modification of Feldt's Test of the Equality of Two Dependent Alpha Coefficients.
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Alsawalmeh, Yousef M.; Feldt, Leonard S. – Psychometrika, 1994
A modification of a test of the equality of nonindependent alpha reliability coefficients is proposed. It avoids the limitation that the product of the number of test parts times the number of subjects be quite large. Monte Carlo studies indicate that this test can be used in comparing interrater reliabilities. (SLD)
Descriptors: Comparative Analysis, Computer Simulation, Equations (Mathematics), Interrater Reliability
Tests for Equality of Several Alpha Coefficients When Their Sample Estimates Are Dependent.
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Woodruff, David J.; Feldt, Leonard S. – Psychometrika, 1986
This paper presents 11 statistical procedures which test the equality of m coefficient alphas when the sample alpha coefficients are dependent. Several of the procedures are derived in detail, and numerical examples are given for two. (Author/LMO)
Descriptors: Analysis of Covariance, Analysis of Variance, Computer Simulation, Hypothesis Testing