Test of goodness of fit proved that when the index of aphid degree was less than 80 and the samples were more than 100, the quantity estimation accuracy was as high as 90%.

对该分级标准及回归模型的拟合检验结果表明，当蚜情指数小于80、抽样量在100株以上时，对蚜量的估计可达90%的准确度。

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Such regions can indicate not only the extent of likely estimation errors but can also reveal whether the estimate for one quantity is too large then the other is also likely to be too large.

这些区域不止能指出可能的估计错误，而且能告诉我们这个估计值对于这个数量是不是太大，从而得知其他也有可能会太大。

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Abstract: BP network is applied in quick estimation of parts cost of Bill Of Quantity(BOQ) in this paper. It provides a new calculation method and theory for meter cost of sub-project.

应用BP神经网络算法对工程量清单的分项工程价格进行快速估算，为分项工程单方造价提供新的计算方法和理论。

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