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
拟合
法中，通常假定模型误
是等。
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拟合法中，通常假定模型误是等。
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