@misc{Krawczak_Maciej_A_2011, author={Krawczak, Maciej and Szkatuła, Grażyna}, copyright={Creative Commons Attribution BY 4.0 license}, address={Warszawa}, journal={Raport Badawczy = Research Report}, howpublished={online}, year={2011}, publisher={Instytut Badań Systemowych. Polska Akademia Nauk}, publisher={Systems Research Institute. Polish Academy of Sciences}, language={eng}, abstract={In this paper is presented a new method for clustering of objects described by nominal attributes. The method is based on the set theory. There are introduced a definition of conditions’ perturbation for each attribute and a measure of clusters’ perturbations. Next, there is defined a measure of clusters’ concentration as well as a measure of cluster’s distance. These two measures resorted to compute an evaluation of clusters’ set. In the paper the new definitions are elucidated by examples, and there is considered a case of data series clustering problem as an illustrative example.}, title={A New Clustering Method for Nominal Attributes}, type={Text}, URL={http://www.rcin.org.pl/Content/109202/PDF/RB-2011-38.pdf}, keywords={Analiza skupień, Clustering, Nominal attributes, Atrybuty nominalne, Theory of sets, Teoria zbiorów}, }