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Download full textWoodruff, David; Wu, Yi-Fang – ACT, Inc., 2012
The purpose of this paper is to illustrate alpha's robustness and usefulness, using actual and simulated educational test data. The sampling properties of alpha are compared with the sampling properties of several other reliability coefficients: Guttman's lambda[subscript 2], lambda[subscript 4], and lambda[subscript 6]; test-retest reliability;…
Descriptors: Sampling, Test Reliability, Item Response Theory, Statistical Inference
