What are VGChartz' sources for weekly US numbers?

[kn]

Archmangus,

I'll not requote as the list is getting long, but you still mention "comparing" VGChartz to "offical" numbers. Again, NPD's, Media Creates, etc. numbers are their "official" numbers but that is the only way the are official. They are estimates, too, and what you should be saying is that you are interested in seeing all of the other sites estimation of sales as well as vgchartz and how each group's official numbers compare. Small point, but unless NPD was exhaustive and funded by the government and then certified by some third party accounting firm, I'd hestiate to ever refer to them as "official".

Oh, and one more note. I'm not bashing NPD. They provide a valuable service to their subscribers.

Sorry about the "statsicts degree" comment. I see that was alvar. This one is tough to follow with all the nested quotes.

To Alvar: You said you have a higher degree in Statistics. You, better than anyone, should realize that everything is an estimate. The only perfect statistics in the world are those that are collected 1:1 and then they aren't statistics any more. That makes NPD, Media Create, and EVERY sales reporting agency's data "guesstimates". The only question is the quality of the guesstimate via statisical analysis.

Anyone truly interested in statistics should pick up and read "Against the Gods". It's a book about the dawn of modern statistical theory for the non-mathemetician.

kn