This work is licensed under the Creative Commons Attribution 4.0 International License.
Marcin Szymkowiak
Poznań University of Economics and Business,
Institute of Informatics and Quantitative Economics, Department of Statistics,
Statistical Office in Poznań
Poznań,Poznań
Kamil Wilak
Poznań University of Economics and Business,
Institute of Informatics and Quantitative Economics
Department of Statistics,
Statistical Office in Poznań
Poznań,Poznań