【作者】 常晓艳； 刘振娟；

【Author】 Chang Xiaoyan Liu Zhenjuan (College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China) Abstract The basic concept of rough set theory is presented, including equivalent relationship, upper/lower approximation, decision rules and attribute reduction. An approach is proposed, which is based on the relative importance of attributes to

【机构】 北京化工大学信息科学与技术学院； 北京化工大学信息科学与技术学院 北京100029； 北京100029；