Question

[Radhi_sas]

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

[Ksharp]

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

[RW9]

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

[Kurt_Bremser]

'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!