What is an interaction?

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The twoway ANOVA model with interactions

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Fitting a model with interactions

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The ANOVA table with interactions

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Hypothesis

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The Ftest

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Assumptions

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Multiple comparisons when interactions are significant

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Tukey and Bonferroni

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Example  Breaks in yarn

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Multifactor ANOVA

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Model for threeway ANOVA

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Estimating parameters

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Checking the assumptions

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Questions of interest

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ANOVA table for threeway ANOVA

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Test the hypothesis

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Interpretation of 3way interactions

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Factors effect when 3way interaction is significant

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Factors effect when 2way interactions are significant

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Factor effects without interactions.

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Example  School days

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