【作者(必填)】BrantlyCallawayaPedro H.C.Sant’Anna

【文题(必填)】Difference-in-Differences with multiple time periods

【年份(必填)】Journal of Econometrics Volume 225, Issue 2, December 2021, Pages 200-230

【全文链接或数据库名称(选填)】https://doi.org/10.1016/j.jeconom.2020.12.001