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
合方法中，通常假定模误差是等方差。
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.
在以上这些回归模合方法中，通常假定模误差是等方差。
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