摘要： 在数据库管理系统中,空值(Null)在所有非主码属性中都可能出现。粗集数据分析不同于其它知识发现方法,特别在模型假设方面的一种方法。文章通过扩展粗集理论,研究了空值的估算方法。
关键词:
粗集,
知识发现,
空值
Abstract: In DBMSs, a null value(also known as missing value) may appear as the value of any attribute that is not a part of the primary key. Rough set data analysis in the knowledge discovery in database(KDD) is different to other KDD methods, especially with respect to model assumption. In this paper, we outline imputation of null values by extending the rough sets model.
中图分类号:
刘业政,杨善林. 基于粗集理论的Null值估算方法研究[J]. , 2001, 27(10): 45-.
LIU Yezheng, YANG Shanlin. Imputation of Null Values Based on Rough Sets Theory[J]. , 2001, 27(10): 45-.