In this paper, we discuss an improved method to quickly calculate relative reducts after some object was deleted from 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 is very computationally intensive and takes a lot of processing time. We proposed a method to quickly calculate relative reducts after some object was deleted from the decision table. However,

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... he problem with this method is that it cannot be used for decision table with inconsistent data. Therefore, we propose a new method that can be used even with inconsistent data.