Torillian said:
Aura7541 said:
NPD gets 95% of its data from retailers with the remaining 5% estimated with their proprietary algorithm. Just because both VGC and NPD extrapolate, the nature of the extrapolation is not identical nor is it even close to being identical. In addition, we have to take into account that VGC frequently makes adjustments to its numbers whereas NPD does not. This last point is what makes NPD and VGC extremely different from each other. The former's data are robust enough that the numbers do not have to be changed down the line. The latter's data are inaccurate that the site has to change its numbers often so that they are not horribly off from data from NPD, GFK, press release numbers, and Media Create.
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I would be curious to see a source for this 95% claim.
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I learned this from Aquamarine. In fact, I can PM him/her for more information if you like.
