The original Grade Correspondence Analysis method (GCA) is utilized to classify Polish households basing on their incomes. One of the main advantages of the GCA is emphasis on the nontrivial visual interpretation of results. The set of households attributes is used to build so called concentration curves and overrepresentation maps. That allows us to easy recognize the importance of the attributes and their relation to incomes values. The results are compared to our previous analysis, based on decision trees.

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