Relational interpretations of neighborhood operators and rough set approximation operators
Information Sciences—Informatics and Computer Science: An International Journal
Rough set approach to incomplete information systems
Information Sciences: an International Journal
Rough Sets: Theoretical Aspects of Reasoning about Data
Rough Sets: Theoretical Aspects of Reasoning about Data
An axiomatic characterization of a fuzzy generalization of rough sets
Information Sciences—Informatics and Computer Science: An International Journal
International Journal of Approximate Reasoning
Axiomatic systems for rough sets and fuzzy rough sets
International Journal of Approximate Reasoning
Neighborhood rough set based heterogeneous feature subset selection
Information Sciences: an International Journal
Set-valued ordered information systems
Information Sciences: an International Journal
Improved heterogeneous distance functions
Journal of Artificial Intelligence Research
Positive approximation: An accelerator for attribute reduction in rough set theory
Artificial Intelligence
Multi knowledge based rough approximations and applications
Knowledge-Based Systems
Set-valued information systems
Information Sciences: an International Journal
International Journal of Approximate Reasoning
A parallel method for computing rough set approximations
Information Sciences: an International Journal
Neighborhood rough sets for dynamic data mining
International Journal of Intelligent Systems
The Axiomatization of the Rough Set Upper Approximation Operations
Fundamenta Informaticae
Composite rough sets for dynamic data mining
Information Sciences: an International Journal
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There are multiple kinds of data in information systems, e.g., categorical data, numerical data, set-valued data, interval-valued data and missing data. Such information systems are called as composite information systems in this paper. To process such data, composite rough sets are introduced, composite relation is defined and composite classes are used to drive approximations from composite information systems. Lower and upper approximations of a concept are the basis for rule acquisition and attribute reduction in rough set theory. To intuitively compute the approximations, positive, boundary and negative regions, matrix-based method is presented in composite rough sets. A case study validates the feasibility of the proposed method.