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
法
，通常假定模型的误差是等差的。
的;的;
表示的;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法，通常假定模型的误差是等差的。
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