你要做什么测试?ols? unit root? granger causality?
是单一方程还是系统simulation测试?后者可以从object-->new object--> system-->...
也可以设立新的pool,...
如果直接从一开始就定义panel data, 数据格式不是我想要的,所以我回避。也不喜欢里面的stacked data排列。所以我都是先定义空的series, 然后一起打开,open group...然后直接从excel sheet copy and paste.. then you will find every series is defined... this method is simple and nice ! i find it myself

hope this is helpful!