Jesper Rydén, Uppsala universitet:The effect of interaction and rounding error in two-way ANOVA: example on impact on testing for normality

A key issue in various applications of analysis of variance is testing for interaction and the interpretation of resulting analysis of variance tables. In this work is demonstrated that for a two-way ANOVA, incorporating interactions or not may have a dramatic influence when considering the usual statistical tests for normality of residuals. The effect of numerical rounding is also discussed. (Joint work with Sven Erick Alm.)

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