Hi Sara. I've searched under web analytics, but there doesn't seem to be any specific procedure. The term is used in accounting in Italian as jargon quite simply for "to net". There are many ways to produce net data in any kind of data processing including web stats, so your "data adjustment" might be more elegant than the "netting the data". As for "reperforming" it is not used in Eng and It in web analytics as far as I can Google.