关键词: 数据归约, 评估指标, 信息量, 统计特征, 数据量

Abstract: The result of data reduction effect evaluation not only reflects the quality of the reduced data set, but also provides the basis for selecting and optimizing the reduction process including the relevant algorithm. Currently, in view of the deficiencies of the data reduction effect evaluation system, such as weak indicators of the suitability and effectiveness of targeted issues, three indicators are proposed: the first indicator reflects the average amount of information in data set before and after the reduction in the degree of reduction; the second indicator reflects the variation in the degree of statistical feature; the third one reflects the variation about the amount of data. These three indicators can provide a quantitative basis for assessing the effect of data reduction quantificationally.

Key words: data reduction, evaluation indicators, information amount, statistical features, data amount