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Data Analysis with R - Second Edition by Tony Fischetti

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Assumptions of ANOVA

The standard one-way ANOVA makes three main assumptions:

  • The observations are independent

  • The distribution of the residuals (the distances between the values within the groups to their respective means) is approximately normal

  • Homogeneity of variance; if you suspect that this assumption is violated, you can use R's oneway.test instead

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