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A graphical user interface allows the interactive analysis of a data set. After calling the quantlet
xtremes (x)a menu box opens which lets the user select a parametric estimation procedure or a nonparametric visualization. Different curves of the same type (e.g. densities, dfs, etc.) are plotted into the same window. Therefore, one can easily compare empirical and parametric versions of a curve. The application of the menus and dialog boxes is self-explanatory.