Lecture 5 - Non parametric Flashcards
When do you use a non parametric ANOVA
If any of these assumptions are broken:
- continuous (scale) DV
- Normal distribution (histograms)
- No outliers (box and whisker - extreme)
- Equal variance (sphericity)
What is the between participants non parametric ANOVA
Kruskal wallis
How does the Kruskal wallis anova rank scores
Ranks in order regardless of group, puts back into groups.
Mean rank and median
What post hoc test does a non parametric between subject design need
Mann whitney U
what does the chi squared value show in a non parametric anova
The association between the levels.
WHat is the within participants non parametric anova
Friedmans
How does the Friedman anova rank scores
ranks scores of individual pps.
What is the non parametric post hoc test for within pps
Wilcoxon
How does the mann whitney u rank scores
Ranks scores of 2 groups and puts back into 1.
Works out which group is higher.
How does the wilcoxon rank scores
Works out the difference between the scores.
Ranks the differences.
THere will be positive and negative ranks.
How do you report a between subject non parametric anova
1. Why was it used: As the data was not normally distributed a kruskal wallis one way anova was performed on factor 1. 2. report the medians: 3. Report the results of the anova x2(x2 val), p= (p val) 4. If significant do bonferroni corrected post hoc mann whitney U 5. Mann whitney U=, p = 6. This suggests that
How do you report the results of a within subject non parametric anova
1. wy was it used: as the data was not normally distributed, a friedmans anova was performed. 2. The medians 3. Report the results of the anova x2= , p= 4. if significant, do bonferroni corrected post hoc wilcoxon tests 5. z= , p = 6. This suggests that
