The Effect of Tracking Students by Ability into Different Schools: A Natural Experiment
研究通过一项自然实验，发现扩大精英班规模后平均教育成果显著提升，为评估能力分班政策效果提供了证据。
The tracking of pupils by ability into elite and nonelite schools represents a controversial policy in many countries. There is no consensus on how large the elite track should be and little agreement on the effects of any further increase in its size. This paper presents a natural experiment where the increase in the size of the elite track was followed by a significant improvement in average educational outcomes. This experiment provides a rare opportunity to isolate the overall effect of allowing entry to the elite track for a group that was previously only at the margin of being admitted.