But the multivariable nonparametric regression function could not be well estimated by the local estimator because there is o nly a little data in the local fields of the high dimension regression variable x . this phenomenon is said to be " the curse of dimension " 但当回归变量是多维向量时，由于x的局部邻域包含很少的数据，用这些估计方法，很难估计出一般的多元非参数回归函数，人们把这种现象称为‘维数祸根’ ( thecurseofdimension ) 。
