paneldata
sas讲义paneldata(编辑修改稿)
7 CS8 1 .0001 Cross Sectional Effect 8 CS9 1 .0001 Cross Sectional Effect 9 CS10 1 .0001 Cross Sectional Effect 10 CS11 1 .0001 Cross Sectional Effect 11 CS12 1 .0001 Cross Sectional Effect 12 CS13 1