Post hoc comparisons - PowerPoint PPT Presentation

I. Statistical Tests: A Repetive Review

I. Statistical Tests: A Repetive Review. Why do we use them? Namely: we need to make inferences from incomplete information or uncertainty But we want them to be “calculated” guesses We want to make them with some minimal likelihood of a wrong inference .

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Post Hoc Tests

Post Hoc Tests. What is a Post Hoc Test?. Review: Adjusting Alpha Level Multiple A Priori Comparisons What makes a test Post Hoc? Many tests could be Post Hoc… But, there are set Post Hoc tests. Studentized Range Statistic q. Studentized Range Statistic q. Independent Groups.

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POST HOC COMPARISONS

POST HOC COMPARISONS. What is the Purpose?. A significant F in ANOVA tells you only that there is a difference among the groups, not which groups are different. Post hoc tests can be done to make specific comparisons. Post hocs also control experimentwise alpha level.

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