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Why do we use ?? in the dataset for ex:  substr(compress(put(subjid,??best.)),4,3);

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It suppress the Error message appear in LOG if subjid is not a digit .

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Used to hide lack of knowledge about the data.  If your getting an Error in the log, then fix it, don't hide it.

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'Used to hide lack of knowledge about the data.  If your getting an Error in the log, then fix it, don't hide it.'


Yes! Yes! Yes!

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