英语语法分析

The kernel estimate of nonparametric regression function has been researched recently.

非参数回归函数的核估计近年来已有了一些研究。

Furthermore, the nonparametric form of bootstrapping makes no assumptions about the underlying PDF.

另外，非参数化形式的bootstrapping不需要对底层pdf做任何假设。

Methods It is discussed by nonparametric piecewise polynomial estimation and least squares estimation.

方法利用非参数分段多项式估计和最小二乘法进行讨论。