More accurate than NPD's? Ioi has stated multiple times that NPD's numbers are more accurate than his own, though I'm not expecting ioi to change his numbers.

What about the fact the Xbox spokeman accepted that they were outsold by PS3 in NA(NPD is for US) in the following article?

http://www.next-gen.biz/index.php?option=com_content&task=view&id=9133&Itemid=2

and this question is pricless ,,lol

There are some people speculating that this is some kind of artificially-created shortage. What do you have to say in response to those kind of accusations? It’s absolutely not accurate. We’re doing everything we can to replenish supply. It’s simply a case of the demand outpacing our forecasts. "

I don't understand ,,why isn't he changing it? ,,,what does he have against this ??

 NPD data are as accurate as they get,even Microsoft and Sony have approved the numbers today

Yeah well, after NPD confirmed that they do not collect data from K-Mart, Toys R US and a few others while VGChartz does, i would say that discrepencies a bound to happen very often between ioi and NPD. But remember when we last adjusted console numbers because of NPD and later it turned out that NPD was wrong and that ioi was right with his data? I would stick to my own data after such a faux pas from NPD's side.

those MS statements lead to another very interesting question:
could a supply-problem hinder the 360's performance once GTA4 hits?

I feel confident loi will change the numbers, as else this website would have to endure far too much criticism with regard to reliability here and elsewhere. I hope they will learn from all these miscalculations though (Australia, UK, US and various European countries) to provide ever more accurate figures, I like this website's efforts a lot.

The problem is mainly when one platform is significantly overtracked and the other undertracked, this doubles the inaccuracy for using the website's figures for comparison purposes and paints a 100% wrong picture (one platform outselling the other for an erea, while in fact its the other way around). This isn't the first time VGChartz overtracked the 360 for the US and undertracked the PS3, I wonder why this continues to be the trend, if it would alternate (under and overtracking for the various platforms) from week to week the end result can still be pretty accurate for the month.

well from what I understand NPD tracks more than 60% of the actual market but VG chartz doesn't even cover %20 of the actual market,,,so which one you think is more likely the accurate one?should we go with the 20% or 60% of actual market?

BREAKING NEWS: PS3 is officially more successful that the 3DO and CD-i

 They will have them sorted out by the time that GTA hits, there are still two months to go

Vgchartz is a retail tracking service that is completely independent. This site has it's own retail samples, and they cover about 15% of the market (Note: I think I remember ioi saying that). That's enough data to make exteemly accurate estimates. Ioi does not copy & paste NPD's numbers, as that would defeat the purpose of this site. If there's a huge gap between VGchartz and NPD's numbers, ioi talks to the publishers and other companies themselfs. Depending on what they, ioi may or may not adjust the numbers. Ioi is not going to change his numbers due to another tracking service. He may, however, use them as tool for other things. Just think of it like this: does Famitsu adjust their numbers because of MediaCreate? No, it doesn't work that way. Both have their own retail samples and data to work with; the same is true with Vgchartz and NPD.