求助两个问题,希望大佬们能不吝赐教,非常感激!!!!!
问题1:请问一下大佬们,用某一个政策进行分析,政策落脚在城市,实在是不理解如下所说的“The strategy (DID)is treated as an exogenous shock, but the criteria for its selection and the homogeneity of its impact on different cities remain unclear.”,其中政策对城市的同质性影响,需要如何解释,具体是什么意思,他对双重差分的影响是什么?
问题2: 此外,用上市公司为样本,我在局限性说了不适用中小微企业,审稿人又说“While the research attempts to examine heterogeneity in the impact of digital economy development on different types of enterprises, the categorization criteria and the rationale behind these distinctions are not thoroughly justified. The heterogeneous effects may be subject to alternative explanations not considered in the analysis. Is authors aware of this and they should address it.”应该如何反驳或者修改。难道还用谁调数据重新做?或者用这个做个基准回归,有没有必要,还是直接反驳?(我真的有点无语)