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Tests of Variance Equality When Distributions Differ in Form, Scale and Location.

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Olejnik, Stephen F.; Algina, James – 1986

Sampling distributions for ten tests for comparing population variances in a two group design were generated for several combinations of equal and unequal sample sizes, population means, and group variances when distributional forms differed. The ten procedures included: (1) O'Brien's (OB); (2) O'Brien's with adjusted degrees of freedom; (3)…

Descriptors: Error of Measurement, Evaluation Methods, Measurement Techniques, Nonparametric Statistics

The Evaluation of Change: New Evidence.

Peer reviewed

Corder-Bolz, Charles R. – Educational and Psychological Measurement, 1978

Six models for evaluating change are examined via a Monte Carlo study. All six models show a lack of power. A modified analysis of variance procedure is suggested as an alternative. (JKS)

Descriptors: Analysis of Covariance, Analysis of Variance, Educational Change, Error of Measurement

Performance of Four Multivariate Tests under Variance-Covariance Heteroscedasticity.

Peer reviewed

Tang, K. Linda; Algina, James – Multivariate Behavioral Research, 1993

Type I error rates of four multivariate tests (Pilai-Bartlett trace, Johansen's test, James' first-order test, and James' second-order test) were compared for heterogeneous covariance matrices in 360 simulated experiments. The superior performance of Johansen's test and James' second-order test is discussed. (SLD)

Descriptors: Analysis of Covariance, Analysis of Variance, Comparative Analysis, Equations (Mathematics)