For assessment effect of cloud seeding for agriculture, contribution coefficient of precipitation to crop production was obtained using integral regression of precipitation.

为评估增雨对农业的影响，利用自然降水对农作物产量贡献的积分回归，获得降水对农作物贡献系数。

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Several Methods of Calculation Break-Even Point are introduced in the paper, with detailed analysis, illustration and inquisition into Contribution Margin Method and coefficient Methed.

本文介绍了预测保本点的几种方法，着重对贡献毛益法、系数法进行详细的分析、说明、探讨，并对它们适用范围进行归纳汇总。

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By analyzing the degree of contribution, we can find whether the selection of Similarity Coefficient or Distance formula is suitable and whether the number of partition is optimal.

它以距离概念为基础，通过对贡献度的分析，检验相似系数或距离公式的选取是否恰当，分类数的选取是否为优。

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