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A General Method for Comparing Effect Magnitudes in ANOVA Designs.
Peer reviewed Peer reviewed
Fowler, Robert L. – Educational and Psychological Measurement, 1987
This paper develops a general method for comparing treatment magnitudes for research employing multiple treatment fixed effects analysis of variance designs, which may be used for main effects with any number of levels without regard to directionality. (Author/BS)
Descriptors: Analysis of Variance, Comparative Analysis, Effect Size, Hypothesis Testing
Approximating Probability Levels for Testing Null Hypotheses with Noncentral F Distributions.
Peer reviewed Peer reviewed
Fowler, Robert L. – Educational and Psychological Measurement, 1984
This study compared two approximations for normalizing noncentral F distributions: one based on the square root of the chi-square distribution (SRA), the other derived from a cube root of the chi-square distribution (CRA). The CRA was superior, and generally provided an excellent approximation for noncentral F. (Author/BW)
Descriptors: Estimation (Mathematics), Hypothesis Testing, Mathematical Formulas, Probability