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NavyNut said:
I'm wondering how they actually calculate the numbers, because from what I've seen for the PS4 it doesn't add up.

Like the time when VGchartz said 4.1 million for PS4 when Sony said 4.2 million some days after for the end of December ? I mean they were pretty accurate.

The only complain I have seen is that in France, PS4's numbers were higher than the vgchartz's estimate. So they fixed that.