Npd vs VGC tracking

[generic-user-1]

Burek said:
So, to sum up your gripe: You believe that ToysRUs sold a incredibly large number of Bayonetta 2, and thus NPD data is 200K less than VGC, which is more accurate because they track less and extrapolate more.

i dont  care about the bayo2 sales, it was just that thread that sparked my interrest about the methods.

 

and yes, tracking less and but more represantive could lead to better numbers.