As a core index of economic variable, exact measurement of real interest rates has an important impact on theory research and policy decision.

实际利率作为经济变量的核心指标之一，其准确的估测对理论研究、政策决策都有重要影响。

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VPRS (variable precision rough set) theory is introduced in the fault diagnosis of bearing, and a decision rule acquisition method of fault is presented.

将变精度粗糙集(VPRS)理论引入到轴承的故障诊断中，提出了一种故障决策规则提取方法。

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To obtain knowledge and data from incomplete decision table(IDT), the paper presents a new doubly variable precision limited tolerance rough set theory model(VPLTRST).

为了能够从不完备决策表（IDT）中进行知识发现和数据挖掘，提出一种新的具有对称性的双重可变精度限制容差关系粗集模型（VPLTRST）。

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