More respect should be shown to the effort put in to tracking sales.

[hsrob]

I agree, people should appreciate that this is a free service.

At least on this site the adjustments are made at different times from the weekly updates and thus are visible to anyone who spends any amount of time here. Generally requests for explanations about large adjustments are addressed by one of the bosses.

My understanding is that NPD just adds any adjustments to the their new figures (at least the publicly available numbers), without any explanation whatsoever. In essence trying to give the impression that their figures are always correct and don't need adjustment.

The fact that we are even aware that adjustments are made on this site tells me that the guys here are serious about providing as good numbers and as much transparency as is feasibly possible.