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Nonparametric methods for unbalanced multivariate data and many factor levels

By Solomon W. Harrar and Arne C. Bathke


We propose different nonparametric tests for multivariate data and derive their asymptotic distribution for unbalanced designs in which the number of factor levels tends to infinity (large a, small ni case). Quasi gratis, some new parametric multivariate tests suitable for the large a asymptotic case are also obtained. Finite sample performances are investigated and compared in a simulation study. The nonparametric tests are based on separate rankings for the different variables. In the presence of outliers, the proposed nonparametric methods have better power than their parametric counterparts. Application of the new tests is demonstrated using data from plant pathology.62G10 62G20 62H10 62H15 62J10 Multivariate analysis of variance Nonnormality Nonparametric model Ordinal data Rank statistic Unbalanced design

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