Between-subjects statistics for three or more groups
Between-subjects statistics can compare three or more independent groups on outcomes
For categorical outcomes and three or more groups, researchers calculate the odds ratio for having an outcome in comparison to a reference category.
With ordinal outcomes, researchers compare the medians and interquartile ranges of three or more independent groups to see if there is a statistically significant main effect.
When continuous outcomes are used with three or more groups, researchers have to meet the statistical assumptions of independence of observations, normality, and homogeneity of variance in order to compare the means and standard deviations between multiple groups.
If the statistical assumptions are not met for between-subjects statistics for three or more groups, then researchers can use non-parametric statistics to compare multiple independent groups on a continuous outcome.
In the event that statistically significant main effects are found for between-subjects statistics for three or more groups (significant main effect = significant difference among the multiple groups), then post hoc tests must be used to explain where the significant main effect comes from in between the groups (post hoc test = which of the groups are different from others).
What is the scale of measurement for the outcome in the between-subjects analysis?
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