The selection index made up of several properties and conditions remarkably correlative with the leaf area has the highest relative efficiency of selection.

由与叶面积显著相关的多个性状组成的选择指数，选择的相对效率最高。

youdao

And with respect to securities selection, you want to consider your skills and you want to consider the efficiency of markets when you're making your decisions as to whether or not to pursue passive management or active management.

证券选择方面,要考虑自身能力与市场有效性,从而决定,是采用被动型管理,还是主动型管理

耶鲁公开课 - 金融市场课程节选