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Why are the numbers SO far off for the PS3 Americas vs NPD?

VGChartz Numbers - November:

Console Wii PS3 X360
America
1,342,483
732,134
1,457,921

X360  1,457,921
Wii 1,342,483
PS3  732,134

 

NPD Numbers - November:

Xbox 360: 1.37 Million ( 68%)
Wii: 1.27 Million ( 0.8%)
PS3: 530k (-25%)

The PS3 looks VERY overtracked.  And seeing the "adjustments" I bet it is being overtracked quite significantly in EMEAA as well.