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。
;,量;;,或然说;;, 以
表示;;;量;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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