The selection of mining methods is a complex process and there is no satisfactory mathematic model to describe it yet.
采矿方法的选择是一个复杂过程，目前尚无满意的数学模型予以描述。
The selection of underground mining methods requires an exact determination of weight coefficients of various influent factors and the existing selection methods haven't solved the problem.
地下采矿方法的选择需要能准确给出各影响因素的权重系数，目前的选择方法未能很好地解决该问题。
The key idea of mining association rules for the basket data is studied and several methods to improve algorithm efficiency and rules selection are given.
对零售业销售数据关联规则挖掘算法的关键思想进行了研究，给出了各种提高算法效率的方法以及对规则选择的方法。
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