In the fitting methods of both the ordinary nonparametric regression models and the varying coefficient regression models, the error term of the models is usually assumed to be homoscedastic.
在以上这些回归模型的拟合方法中，通
模型的误差是等方差的。
词
理的;
表示的;In the fitting methods of both the ordinary nonparametric regression models and the varying coefficient regression models, the error term of the models is usually assumed to be homoscedastic.
在以上这些回归模型的拟合方法中，通模型的误差是等方差的。
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