请教老师面板回归中one-way clustering,two-way clustering

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连老师，您好！收到审稿：“the clustering of firm and year effects will significantly reduce the t-statistics. The author should use one-way clustering or two-way clustering. This is particularly true for the panel data involving accounting ratios. See Petersen’s webpage at Northwestern University about the programs and reference paper in RFS.”不太清楚one-way clustering,two-way clustering是什么？请您指教。谢谢

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关键词：Clustering Cluster TERI RING Erin

参见： 聚类调整标准误笔记 https://www.jianshu.com/p/a096f3e3e821