TWRoO on 22 April 2008
Actually I am not certain, but the NPD data I assume you are using (Jan+Feb+Mar) should in fact coincide with different VGC numbers than what you have. I think December NPD ran into January (week ending 5th Jan was in December NPD) so that the VGC weeks you should use are these: (both dates are for the week ending on that date)
VGChartz Hardware data for the period 12th Jan 2008 to 05th Apr 2008:
| Console | Wii | PS3 | X360 |
America | 1,597,386 | 917,071 | 918,485 |
so to compare with NPD USA
Wii - 1426
PS3 - 806.8
360 - 746.6
(multiplying by 1.1 because I don't know the Canada numbers)
| Console | Wii | PS3 | 360 |
| VGC | 1,597,386 | 917,071 | 918,485 |
| NPD*1.1 | 1,568,600 | 887,480 | 821,260 |
| discrepancy | +1.84% | +3.33% | +11.84% |
This may not be totally accurate because I do not know the preferences of the Canadians (they may buy more than 10% of American 360s, which would put the numbers closer)
However it does show that VGC is incredibly close for both PS3 and Wii, and ioi has maintained for a while that NPD undertracks 360 so the increase there makes sense.
