Approximation and decomposition of Gini, Pietra-Ricci and Theil inequality measures

Two related problems are dealt wit

Financial variables analysis by inequality decomposition

This paper illustrates the use of the methods related to inequality decomposition for the analysis of financial variables. By means of the overlapping component and of the inequality between it is possible to detect and to assess the main factors determining the cross section assets variability

A review on heterogeneity test: some permutation procedures

When dealing with categorical data, generally the notion of heterogeneity may be used instead of that of variability. There are many fields where data may be only represented by nominal categorical variables or by ordinal variables, e.g. opinion polls, performance qualitative assessments, psycho aptitude tests and so on. In this paper we provide a review of some nonparametric methods concerning testing for heterogeneity, based on permutation procedures. Examples of real applications in different frameworks are also shown