reask said:
I mean margin of error say 4% 6% that kind of thing.
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oh. I'm not sure exactly. I know VGChartz strives for 10%. I would imagine NPD would be 5-10%, but I don't know.
Suposedly Reggie said that we are within 20% for Nintendo hardware on weekly sales, and within 5% of LTD. Reggie claims he knows his numbers, but I really don't know exactly where he is getting them from. Nintendo used to demand that all retialers scan in the serial number for each device they sold, so Nintendo would know exact sales at any one moment. That may still be the case (hence why you don't need a receipt for warranty) so Nintendo may know exactly how far off NPD and VGChartz is.