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
法中，通常假定模型的误差
差的。
词
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法中，通常假定模型的误差差的。
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