Methods of local linear regression, analysis of regression and hypothesis testing were employed.

研究方法：局部线性回归、回归分析和假设检验。

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Therefore, the traditional methods are inclined to bring many problems like model-choosing, over-fitting, non-linear, disaster of dimensionality, local minimum.

于是，这些传统方法常常被模型选择与过学习问题、非线性和维数灾难问题、局部极小点问题等困扰。

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