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This text reviews a set of widely used summary inequality measures, and the lesser known relative distribution method provides the basic rationale behind each and discusses their interconnections It alsintroduces model-based decomposition of inequality over time using quantile regression This approach enables researchers testimate twdifferent contributions tchanges in inequality between twtime points Key Features: - Clear statistical explanations provide fundamental statistical basis for understanding the new modeling framework - Straightforward empirical examples reinforce statistical knowledge and ready-to-use procedures - Multiple approaches tassessing inequality are introduced by starting with the basic distributional property and providing connections among approaches This supplementary text is appropriate for any graduate-level, intermediate, or advanced statistics course across the social and behavioural sciences, as well as individual researchers