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SOLIDSNAKE08 said:
ps3 WILL win becasue npd dont track walmart. ps3 will actually win by quite a margin. those weeks where 360 outsold ps3 will bo non existant for npd.

If they have worked like that, nobody would have taken them seriously.. rather they would be out of the business by now.. So they make some good estimates of Walmart missing data which is subject to some errors, but i m confident that they r not too large..