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Finally, to meet the fourth objective [test effect of policies on forest trends], we will utilize data on the location and timing of key forest policies in Sichuan and again use econometric techniques to quantitatively analyze the impact of these forest policies on forest cover.
最后，为了达到第四个目标（关于森林趋向政策的实验效果），我们将利用地理位置和四川关键的森林政策的数据并再次利用经济学技术来从数量上分析那些森林政策对森林覆盖/植被覆盖造成的影响。
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。
Although these program evaluation methods have not yet been combined with spatial econometric techniques, they are being used by the best economists in the world to evaluate the impact of other policies on outcomes in rural areas .
虽然这些项目评估方法还没被跟空间经济学技术结合起来过，但是它们正在被那些最好的经济学家用来评估其他政策对乡村地区成果的影响。

最后，以满足第四个目标[测试政策效应，对森林趋势] ，我们将充分利用数据上的位置和时