We ran a quasi-experiment because random assignment wasn’t possible. 由于无法进行随机分配,我们进行了准实验。
Using a policy change as a natural cutoff, the researchers built a quasi-experiment to estimate the program’s causal impact on graduation rates. 研究者利用政策变化形成的自然分界构建准实验,以估计该项目对毕业率的因果影响。