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Forums - Sales - YTD Comparison of NPD and VGChartz.

TWRoO on 19 July 2008
Sqrl said:
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.

It doesn't make much of a difference, it depends on whether "the rest" is meant to be 10% of USA or 10% of the whole Americas. I assumed ioi meant it was of USA.

Even then it is just a vague number to help work it out, I wish he would split it into "USA", "Canada" and "other Americas" (the last one would be mostly Mexico I think, allthough Brazil must be a decent enough market)

 



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Sqrl on 19 July 2008
TWRoO said:
Sqrl said:


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.

It doesn't make much of a difference, it depends on whether "the rest" is meant to be 10% of USA or 10% of the whole Americas. I assumed ioi meant it was of USA.

Even then it is just a vague number to help work it out, I wish he would split it into "USA", "Canada" and "other Americas" (the last one would be mostly Mexico I think, allthough Brazil must be a decent enough market)

 

Well ioi is always telling people that to get the US only its roughly 90% of VGC numbers. It really does make a difference in the final percentages for each console and it still makes a big difference in the average, by my calculation the average is 50% different if you do it the wrong way.

As much as it is intended as a rough indicator this type of stuff is still cause for a lot of bashing on VGC so I'd still rather see it done right.

I agree though splitting it would be nice, but its hard to say what that would involve..not too mention he would have to go back and split it retroactively.
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