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ioi said:
I don't believe anyone said a consistent 30% undertracking (unless I misunderstood). I think in some cases they could undertrack a given game in a given month by 30% but obviously this will be counterbalanced by some games being overtracked and so on.

No, the Sega studio head said NPD was usually under by 30% according to their "retail partners".  He seemed rather uninformed in general though, and I'd say it's pretty likely he was confusing shipments, regions, or something.