杨心影 发表于 2017-5-11 23:07 
必须是平衡面板数据
请问,我的确定是平衡面板,为什么stata还是要报错呢?
xtset province1 year
panel variable: province1 (strongly balanced)
time variable: year, 1978 to 2017
delta: 1 unit
总是报错:Panel threshold model need balanced panel, check your data!
要哭了!求帮助!