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
上这些回归模型
拟合
法中，通常假定模型误
是
。
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.
在上这些回归模型拟合法中，通常假定模型误是。
：
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