In data streams analysis, detecting concept-drifting is a very important problem for real-time decision making. In this paper, we propose a new method for detecting concept drifts by measuring the difference of distributions between two concepts. The difference is defined by approximation accuracy of rough set theory, which can also be used to measure the change speed of concepts. We propose a concept-drifting detection algorithm and analyze its complexity. The experimental results on a real data set with a half million records have shown that the proposed algorithm is not only effective in discovering the changes of concepts but also efficient in processing large data sets.
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