Obviously, the easiest way was just using the "difference-in-differences" analysis, which was popular among many areas of economics.

显而易见，最简单的办法就是使用“双重差分法”(亦译作“倍差法”)，其在经济学的很多领域得到了广泛应用。

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We will explore new methods that combine spatial econometric techniques and methods used in the program evaluation literature such as difference-in-differences and propensity score matching methods.

我们将探索把空间经济学技术和那些被用在项目评估文学中的方法结合起来的新方法，如“异中求异”的方法和倾向匹配划分方法。

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This striking difference must have some effect and, because the difference is in the parts of the brain involved in intellect, we should be looking for differences in intellectual processing.

这种显著的差异肯定有一定的影响，而且，由于这种差异存在于大脑中与智力有关的部分，我们应该寻找智力处理过程中的差异。

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