【摘要】 对在实际应用中,信息系统的属性通常具有期望,比如量器的测量误差、产品质量标准、医疗生理指标等,为此本文定义了期望序信息系统,在一定程度上将无期望的序信息系统推广为期望序信息系统,并在期望序信息系统的基础上,构建了基于距离的优势关系,使用辨识矩阵的方法进行了属性约简,最后经过实例证明方法简单可行。更多还原

【Abstract】 In real world applications, the attributes with expectation, such as the measurement error, the quality standards of products and biological indicators for medical treatment, should be considered by decision makers. Therefore, the concept of ordered information system with expectations is proposed. Moreover, we extend the general ordered information systems to ordered information systems with expectations based on the dominance relation by the distance between the expectation and the real value. Consequently, attribute reduction of an ordered information system with expectations is investigated by discernibility matrix. Finally, an example illustrates that the method is simple and feasible.更多还原