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So, I noticed that the sales numbers for Americas hasn't been updated for Novemeber yet on this site. For example, NPD has the following numbers for November:

360 - 1.37M

PS3 - 530k

For the same time period (from Nov 1 - Nov 27) VGChartz currently shows:

360 -1,457,921

PS3 - 732,134

Why the difference? Does VGChartz count other countries in the America's total than NPD does?