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Zuhyc said:
You do realise that NPD (just like VGC) estimates the sales numbers of the USA.

If you want to estimate the NPD numbers, you are basically estimating an estimation.

Please don't post nonsense. NPD get real  sales from 90% of retailers, they are so accurate that nintendo/sony/micosoft use there numbers, vgchartz is just some estimate from  few insider sources.