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The history of this site has been that if a console (eg, the PS3) has been under tracked, the numbers will be corrected.

There is no correct source of numbers except the numbers posted as shipments by the video game companies themselves. The NPD numbers are most likely the closest to correct, yes, and VGChartz is dealing with smaller sample sizes and seemingly has to rely a little more heavily on various components of its formula that make it a little less fluid in the case that sales swing heavily or make unexpected turns.

Let VGChartz work through its growing pains without being so negative. We all see that there was a problem -- almost everyone was surprised by the NPD's numbers.