序决策形式背景的规则提取及属性约简*

基于含有多值决策信息的决策形式背景，提出序决策形式背景的概念及其序决策概念格的相关理论，给出序决策概念格的决策规则及规则的置信度与支持度，并讨论决策规则在实际应用中的意义.在此基础上定义保持规则不变的属性约简，同时得到保持序决策概念格结构不变的属性约简方法.最后讨论序决策形式背景保持规则不变的约简与保持格结构不变的约简之间的关系.

Rules Acquisition and Attribute Reduction of Ordered Formal Decision Contexts

Based on the formal decision context containing multi-valued decision information, the concept of the ordered formal decision context and the correlated theory of ordered decision concept lattice are proposed. In addition, the decision rule of the ordered formal decision concept lattice as well as the confidence level and the support degree of the rule is given, and the significance of decision rules in the practical application is discussed. Furthermore, the rule-preserved attribute reduction is defined. Meanwhile, the attribute reduction method of ordered decision concept lattice structure preservation is obtained. Finally, the relationship between the rule preserved reduction and the lattice structure preserved reduction of the ordered formal decision context is discussed.