non parametric anova

Friedmans test

non parametric equivalent for repeated measures above

kruskal Wallis test

a non parametric equivalent for between groups anova

when do we use non-parametric tests

• data does not meet parametric normality assumptions

• homogeneity of variance has been violated

• data is ordinal or nominal

what descriptive measure is reported in Friedmans test?

median

role of post hoc tests?

tell us where a significant difference lies

effect size guidelines…

0.1- small

0.3- medium

0.5- large

what post hoc test is used for a within design ?

wilcoxon test with a bonferroni correction

what is the alpha level in a post-hoc test?

.017

what post hoc test is used after a kruksal Wallis anova test?

Mann-u Whitney with a bonferroni correction

the effect size for a Wilcox test is…

the z statistic divided by the square root of the number of observations

kruskal-wallis test is based on…

ranks of the between groups

the friedman’s test is based on…

the sum of ranks