Boxplots compare very clearly the data in different groups:
> 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.
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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