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Graphical representation of multiple numeric groups

Boxplots compare very clearly the data in different groups: 

code:

    > ggplot(bwdf, aes(x=race, y=age))+ geom_boxplot(notch=T, varwidth=T)

                

Again overlapping notches of 2 groups indicate no significant difference between 2 groups. 

Effect size:

Eta-squared is used as an effect size for ANOVA. This gives fraction of change in outcome variable accounted for by grouping variable.


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