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starcraft said:

The very point is that NPD also has a substantial margin of error (though I would never argue this margin is as big as VGC's).

You get what you pay for.  Ultimately ioi has to rely on a small percentage of retailers to produce weekly numbers (by waiting, NPD can of course wait for firmer numbers from a wider range of suppliers).

Eventually we'll get region by region shipping approximations and get a better idea of what is really going down in NA.  Until then, so much complaining about a set of numbers never claimed to be 100% and provided entirely for free!

all that doesnt mean we cant point out when the numbers logically seem wrong or when we got more concrete data that shows its wrong.