Just for the record NPD is doing analysis just like VGC is. It is very unlikely that either of them are exact and there isn't really a good way to tell who is even closer.
I would point out that ioi doesn't hide from discrepancies and never once has he stated that his numbers are the most accurate (to my knowledge anyways). The statement VGC makes is that it is the most comprehensive freely available video game charts in the world. ioi is constantly working to fine tune the numbers and he routinely makes changes and adjustments as a result. I don't see how people can bash him for trying to improve.
With that said, it is fair to look at the difference and try to make sense of it. Obviously at least one of the two is off and figuring out why only enables VGC to bring their analysis and calculations closer and closer to the exact numbers.
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| To Each Man, Responsibility |
