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Nonparametric Statistics2
Statistical Significance2
Analysis of Covariance1
Analysis of Variance1
Comparative Analysis1
Mathematical Models1
Sampling1
Statistical Analysis1
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Educational and Psychological…1
Journal of Experimental…1
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Levy, Kenneth J.2
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A Monte Carlo Study of Analysis of Covariance under Violations of the Assumptions of Normality and Equal Regression Slopes.
Peer reviewed Peer reviewed
Levy, Kenneth J. – Educational and Psychological Measurement, 1980
Analysis of Covariance (ANCOVA) is robust with respect to dual violations of the assumptions of equal regression slopes and normality of distributions provided that group sizes are equal, but displays disruptions of empirical significant levels when unequal regression slopes and unequal group sizes are coupled with nonnormal distributions.…
Descriptors: Analysis of Covariance, Nonparametric Statistics, Statistical Significance
Nonparametric Large Sample Many-One Comparisons.
Peer reviewed Peer reviewed
Levy, Kenneth J. – Journal of Experimental Education, 1979
Dunnett's procedure for comparing K-1 treatments with a control is discussed within the context of three nonparametric models: those of Kruskal-Wallis, Friedman, and Cochran. (Author/MH)
Descriptors: Analysis of Variance, Comparative Analysis, Mathematical Models, Nonparametric Statistics