A view on rough set concept approximations

Authors:
Jan Bazan;Nguyen Hung Son;Marcin Szczuka
Affiliations:
Institute of Mathematics, University of Rzeszów, Rejtana 16A, 35-959 Rzeszów, Poland and Institute of Mathematics, Warsaw University, Banacha 2, 02-097 Warsaw, Poland;Institute of Mathematics, Warsaw University, Banacha 2, 02-097 Warsaw, Poland;Institute of Mathematics, Warsaw University, Banacha 2, 02-097 Warsaw, Poland
Venue:
Fundamenta Informaticae - Special issue on the 9th international conference on rough sets, fuzzy sets, data mining and granular computing (RSFDGrC 2003)
Year:
2003

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Abstract

The concept of approximation is one of the most fundamental in rough set theory. In this work we examine this basic notion as well as its extensions and modifications. The goal is to construct a parameterized approximation mechanism making it possible to develop multi-stage multi-level concept hierarchies that are capable of maintaining acceptable level of imprecision from input to output.