最近在做短非平衡面板数据的单位根检验，试了很久只有fisher可以用，但是帮助文件里面有这么两句话“These tests assume that T tends to infinity.  If the number of panels, N, is fixed, then these tests are consistent against the alternative that at least one panel is stationary.  ”，这是不是说明短面板不适合用fisher啊？脑壳疼，求各位大侠指导，谢谢！