Rough sets: probabilistic versus deterministic approach
International Journal of Man-Machine Studies
Variable precision rough set model
Journal of Computer and System Sciences
Information Sciences: an International Journal
Decision Making with Probabilistic Decision Tables
RSFDGrC '99 Proceedings of the 7th International Workshop on New Directions in Rough Sets, Data Mining, and Granular-Soft Computing
Computers and Operations Research
Research on the model of rough set over dual-universes
Knowledge-Based Systems
Two-level hierarchical combination method for text classification
Expert Systems with Applications: An International Journal
Feature subset selection wrapper based on mutual information and rough sets
Expert Systems with Applications: An International Journal
Comparative study of variable precision rough set model and graded rough set model
International Journal of Approximate Reasoning
Dominance-based rough set model in intuitionistic fuzzy information systems
Knowledge-Based Systems
Bayesian rough set model: A further investigation
International Journal of Approximate Reasoning
International Journal of Approximate Reasoning
Information Sciences: an International Journal
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Rough set theory is a new mathematic tool aimed at data analysis problems involving uncertain or imprecise information. As an important extended rough set model, variable precision rough set model (VPRSM), which was introduced by Ziarko, enhances the ability to deal with datasets which have noisy data. Reduct is one of the most important notions in rough set application to data mining as well as in VPRSM. Unfortunately, there are some anomalies in the procedure of attribute reduction using Ziarko's reduct definition, therefore, defining and finding more reasonable reducts are in requirements. Some kinds of reduction anomalies are analyzed in detail, the concept of inclusion degree (@b) threshold is put forward and the relationship between inclusion degree and classification quality is discussed in this paper. The reduct definition extends from a specific @b value to a @b interval, and reduct hierarchy was constructed based on @b interval features. Then reduct can be elucidated from different levels (viz., the quality of classification, positive region and decision class), and reduction anomalies can be eliminated gradually according to restricting reduct definition conditions. All of these notions develop the variable precision rough set mode further.