关键词: 数据挖掘, 粗糙集, 概率测度, 分类精度, 近似空间

Abstract: In order to obtain the statistics characteristic of classification rule of data mining，a new method of mining probability rule is put forward in this paper.Firstly，the classification of probability rule is analyzed on the base of classic rough set concepts and extended to the equal relation of set in the indefinite system，namely，the upper and lower approximation space of research set is expressed in the form of conditional probability；then，according to the measure of probability rule，the attributes reduction is carried out and the classification rule is extracted by using the related parameters of condition attributes’ impend precision from the angle of conditional probability；Finally，the related simulation test result is given and the result shows the classification rules with probability measures is more rational.

Key words: data mining, rough set, probability measure, classification precision, approximation space