Torillian said:
NPD are estimates based on a certain coverage of actual data from retailers and distributors, VGC numbers are estimates based on a lower coverage of actual data from retailers and distributors. There's certainly a difference, but they aren't completely different methods like you are insinuating in the previous post. |
NPD is using more empirical data, which VGChartz just plain doesn't have access to. The difference is damn near science vs. magic. Did we ever get an official formula on how Chartz gets their numbers, or is it still pretty much an old woman using tea leaves? You don't ever see NPD having to go back and adjust figures based on VGChartz numbers, no? One of these sources is more reliable than the other.
