The optional polynomial order is selected through the test of the partial fitting square sum on the basis of the variance analysis of the fitting equation.
对拟合方程进行方差分析并在此基础上利用偏拟合平方和的检验确定拟合多项式的最佳阶数。
It is proved that the combining ridge and principal components regression have the minimum variance sum in the class of reduced-dimension estimators.
证明了在一类岭型降维估计中，岭型主成分估计的方差和最小。
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