NPD undertracking, VGchartz overtracking, or a little of both?

[largedarryl]

Max King of the Wild said:

largedarryl said:
NPD tracks sold to consumer as well. I did a quick check for the Wii numbers and VG is pretty close.

NPD lists 15.3 for Wii
Vg is currently at 20.03, then if you subtract the last 3 weeks of sales you get 17.69 for NA at the end of November. This number *0.9 = 15.92 million consoles and that is an error of 2.0%

I don't plan on doing any of the other consoles, but 2% error is negligible.

 

 your math is severly off if you think thats 2% difference

Sorry for that incorrect math, it would be a 4% difference if you want that number, although it doesn't change my conclusion.  Is there anything else you think is wrong in my calculation?