Least square method of polynomial or the method based on the given function are used to fit pump characteristic curve in pump selection or operation.

在水泵的选型或运行中，通常采用多项式的最小二乘法或根据假设的函数关系来拟合水泵性能曲线。

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Lastly least square method is used to fit for the straight line. The improved method can extract so much information as possible from original images.

改进后的方法能尽可能多地从图像中提取直线信息，既可以较准确地提取直线的端点信息，又能得到直线的准确表示。

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The total income of national economy and the amount of population are predicted with second-degree moving model and with the principle of least mean square fit error determining designated value n.

利用二次移动平均模型，引入均方拟合误差最小的原理确定出时段数n，对国民经济总收入、人口数量等项目进行了预测。

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