A view on rough set concept approximations

Authors:
Jan Bazan;Nguyen Hung Son;Andrzej Skowron;Marcin Szczuka
Affiliations:
Institute of Mathematics,University of Rzeszów, Rzeszów, Poland;Institute of Mathematics, Warsaw University, Warsaw, Poland;Institute of Mathematics, Warsaw University, Warsaw, Poland;Institute of Mathematics, Warsaw University, Warsaw, Poland
Venue:
RSFDGrC'03 Proceedings of the 9th international conference on Rough sets, fuzzy sets, data mining, and granular computing
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 parameterised 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.