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jlauro on 28 October 2017
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RJ_Sizzle said:
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 NPD having to go back and adjust figures based on VGChartz numbers, no? One of these sources is more reliable than the other.

Back when NPD used to release some of their numbers there were a few instances where they were proven to be way off from official numbers.  NPD numbers looked real bad as the adjustments for the following quarters tried to "correct" their problem instead of going back and fix the quaters that were way off...  So, yes, vgchartz is more reliable when looking at historical data as it has been corrected instead of adjusting data of the quaters after to cover up their mistakes of previously published data.