YTD Comparison of NPD and VGChartz.

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famousringo said:

 

I'll see your table and raise you a % comparison.

Console	Wii	PS3	X360	PSP	DS
VGC Americas	3,911,078	1,711,802	1,638,405	1,680,688	3,628,702
NPD (US Only)	3,482,000	1,608,000	1,354,000	1,482,000	3,187,000
Percent Difference	12.3%	6.5%	21.0%	13.4%	13.9%

 

Average difference between NPD and VGC across all platforms is 13.4%. If you adjust NPD numbers up by 10% to estimate the rest of the Americas market, then Xbox 360 is the only hardware which is more than 10% off NPD's estimate. I've seem to recall ioi stating that he thinks NPD undertracks the 360, so I guess this is expected.

 

I'm pretty sure you need to lower VGC by 10%, not raise NPD by 10%.

Lowering VGC 10%:

Console	Wii	PS3	X360	PSP	DS
VGC Americas	3,519,970	1,540,622	1,474,565	1,512,619	3,265,832
NPD (US Only)	3,482,000	1,608,000	1,354,000	1,482,000	3,187,000
Percent Difference	1.09%	-4.19%	8.90%	2.07%	2.47%

Off by 2.07% on average.