In this paper,we proposed an improved pre lest estimator called pre test ridge regression estimator (PTRRE) and established some statistical properties of PTRRE.
针对这种情况，本文提出了预检验估计的一种改进估计———预检验岭估计，并讨论了它的许多优良性
Checking and Conversion System of Land and Resources Spatial Data;
国土资源空间数据预检转换系统