聚类有效性评价对聚类分析具有重要意义，是聚类分析的瓶颈之一。
The evaluation of clustering validity is important for clustering analysis, and is one of the bottlenecks of clustering analysis.
以灰色聚类为基础，提出了梯形灰色聚类分析法，并将其应用于环境质量评价之中。
Based on the gray assembles, the trapezium gray analysis is presented, and it is applied to environmental quality assessment.
以灰色聚类为基础，提出了灰色模糊聚类分析法，并将其应用于土壤环境质量评价中。
Based on grey collection, grey collection analysis method is pointed out and applied to assessment of soil environmental quality.
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