升级到stata17se版本,但是 xtdidregress 不能用
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我用 xtdidregress这个函数,如下面所示:xtdidregress (syn $ctrls) (treatPolicy), group(sid) time(year) vce(cluster sid )
invalid group specification
None of the groups defined by sid are treate ...
2022-2-15 18:13 - 啦啦啦lzx - Stata专版