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5非参数回归法如果y方向误差不服从正态分布，或者x和y方向均有误差存在时，y对x的不加权最小二乘法回归方程不一定合适，如有异常值存在时，计算和解释就更复杂了。对偏离假设的统计模式不敏感的方法，称为稳健方法。非参数方法常具有这种性质（稳健方法不全是非参数方法）。
5 Nonparametric regression method If the error in the y direction does not obey the normal distribution or the error exists in both the x and y directions, the unweighted least-squares regression equation of y to x is not necessarily suitable. If there is an outlier, Interpretation is more complicated. Methods that are insensitive to deviating statistical models are called robust methods. Non-parametric methods often have this property (robust method is not a non-parametric method).