BS ANOVA

11 important questions on BS ANOVA

Why use an anova and not multiple t-tests?

Because of the family wise error rate

What is the H0 in an anova?

All groups are equal

What are you testing with an anova?

The simplest model is the grand mean=no effect
Different model= hypothesis= group means
Is the different model better than the simplest model
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What is the total sum of squares?

The deviation from each score to the grand mean, summed

How do you calculate the average sum of squares (mean squares)?

MS=SS/df

When do you use Tukey or REGWQ posthoc procedure?

Equal sample sizes and similar group variances

Which post hoc do you use in unequal sample sizes?

Gabriel or hochberg GT2

Which post hoc do you use in unequal group variances?

Games -Howell

What are post-hoc procedures?

Exploring the data for any between group differences between means
Pairwise comparisons of all combinations of treatment groups
Doing several t-test with control of family wise error.

Which values of ANOVA do you report?

F(df between groups, df error)=value of f and it's significance

What do you report in methods about anova?

What test (ANOVA)
What was used for effect size
What post-hoc
Normality
Homogeneity of variance

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