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Computer Simulation2
Test Reliability2
Error of Measurement1
Estimation (Mathematics)1
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Educational and Psychological…2
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Zimmerman, Donald W.2
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Coefficient Alpha as an Estimate of Test Reliability under Violation of Two Assumptions.
Peer reviewed Peer reviewed
Zimmerman, Donald W.; And Others – Educational and Psychological Measurement, 1993
Coefficient alpha was examined through computer simulation as an estimate of test reliability under violation of two assumptions. Coefficient alpha underestimated reliability under violation of the assumption of essential tau-equivalence of subtest scores and overestimated it under violation of the assumption of uncorrelated subtest error scores.…
Descriptors: Computer Simulation, Estimation (Mathematics), Mathematical Models, Robustness (Statistics)
Variability of Deviation IQ's Based on Multiple-Choice Test Scores.
Peer reviewed Peer reviewed
Zimmerman, Donald W. – Educational and Psychological Measurement, 1985
A computer program simulated guessing on multiple-choice test items and calculated deviation IQ's from observed scores which contained a guessing component. Extensive variability in deviation IQ's due entirely to chance was found. (Author/LMO)
Descriptors: Computer Simulation, Error of Measurement, Guessing (Tests), Intelligence Quotient