用stata xtptm 命令做面板数据门槛回归时,出现r(3301)错误是哪里出错了,各位大神急求啊!!
. xtptm cs ztp hy zy ,rx(ty) thrvar(tq)
<istmt>: 3301 subscript invalid
r(3301);
error . . . . . . . . . . . . . . . . . . . . . . . . Return code 3301
subscript invalid
The subscript is out of range (refers to a row or column that
does not exist) or contains the wrong number of elements.


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