A study on definition and computation of new reducts in variable precision rough sets

Abstract

In this paper, we discuss an improved method to quickly calculate relative reducts after appending some objects to the decision table. In general, when a decision table that has already created relative reducts is updated, it is necessary to calculate all relative reducts again. However, recalculation of all relative reducts requires a lot of time and storage area. Therefore, we propose a new method to calculate relative reducts quickly and easily after appending some objects to the decision table.