通常情况下，回归估计的效率高于系统抽样。
The efficiency of regression estimate was usually higher than systematic sampling.
为了进一步提高运动估计的效率，本文提出了一种新的快速搜索算法。
In order to enhance motion estimation efficiency, this paper presents a new fast search algorithm.
纵向数据为典型的相关数据，数据方差结构选择的正确与否直接影响估计的效率。
Longitudinal data is typical related data, and it is desirable to choose correct data variance structure since the correct structure affects the efficiency of estimation.
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