【摘要】 本文定义了一类新的降维估计，称之为岭型压缩主成分估计。证明了，当参数满足一定条件时，它比主成分估计，岭型主成分估计及最小二乘估计有较小的均方误差。更多还原

【Abstract】 A new estimate, the ridged shrunken principal components estimate advised in the article, has proved that the MSE of it is less than the MSE of principal components estimate,ridged principal component estimeate and least square estimate when parameter is in certain contentment更多还原