within subjects ANOVA

Question 1

What are the differences in assumptions for within compared to between

Answer 1

within has homogeneity so instead of stating that we state the sphericity
* Sphericity means that the variances of the differences between all possible pairs of
conditions (i.e., levels of the independent variable) are equal

for this look on the spherecity table and find the sig score and the chi squared score- we want sig to be non significant. It is written like this
Mauchly’s test indicated that the assumption for sphericity was met, x2 (2)=.955, p=.620
.995 is the chi squared value

Question 2

how to report the ANOVA

Answer 2

F (IV df, ERROR df) = F value, p value, effect size

Question 3

writing up formally

Answer 3

1. Present means and SDs in table
2. State the ANOVA type, effect of IV on DV
3. Mention the assumptions (sphericity)
4. Report the ANOVA results giving df, F-ratio & p-value
5. Report the effect size and what this size means (Effect size for repeated measures - ANOVA is partial eta squared, or ƞ2 (cohens 1988 guidelines)
6. Report any comparison results
   7.short interpretation of the results

Question 4

what is spherecity is violated?

Answer 4

?