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xtoverid error for "operator not allowed"

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xtoverid error for "operator not allowed"

Qian Yu
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Dear all
      I encountered a problem of "xtoverid". After I input the command "xtoverid2, noi robust", the error says that "o. operator not allowed". I found this is very weird, since this command works for another bigger sample, but it doesn't work for this small sample.  Could anyone give me some advice?

Many thanks in advance,
Qian
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