品牌价值内涵和构成的复杂性及近似抽象性，导致评估方法多元化和评估结果差异化。
Brand value connotation and composition of complexity, and approximate abstractness, cause evaluation methods diversity and assessment results differentiation.
文章用拟合方法给出了复杂系统的有效度单边近似下限解，可用来计算卫星系统的有效度单边近似下限，并为评估卫星系统的最短寿命提供数据参考。
This paper gives the one-side approximate lower limit of complex system availability by using fitting method, it can be used in reference to evaluate the shortest life of satellite system.
同时，提出使用属性选择和实例选择方法实现近似挖掘的方案，并对该方案进行挖掘效率和结果模型准确性的分析评估。
At the same time, the solution using attribute selection and instance selection to realize the approximation mining is brought out, and the mining efficiency and result model.
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