Social and natural sciences employ a number of different measures of diversity. The presents paper surveys those depending on the distribution of abundances among a given set of categories. Characteristic properties of the measures are generalized and a unifying notation is derived. It is argued...

In this note I show that Tsallis entropy (Tsallis, 1988) is not unique in the class of non-additive, selfweighted and quasilinear means. A characterization is given which disproves a result in Dukkipati et al. (2005a,b) and Dukkipati et al. (2006).

Jost [Jost, L., 2006. Entropy and diversity. Oikos, 113: 363-374.] recently discussed Hill's [Hill, M., 1973. Diversity and evenness: a unifying notation and its consequences. Ecology, 54: 427-431.] effective number of species and concluded by naming it the "true" diversity. In this note we...

Aufgaben -- Lösungen -- Schätzung I: Punktschätzung -- Indikatoren für die Qualität von Schätzverfahren -- Schätzung II: Intervallschätzer -- Hypothesentest -- Fortgeschrittene R-Anwendungen -- Verwendete R-Befehle -- Verwendete Datensätze.