RAZurrection said:
Yes and the fact that both seperate entities usually come within similar results of each other consisitantly, weekly and over a number of years gives us an "acceptable" margin of error for their estimates is why they're both considered the best source if averaged out. Compare that to VGC who basically just guesses for the month, then either leaves it as it is if correct. or alters it drastically depending on how innaccurate it is, which just invalidates their methods.
Have they ever made adjustments to fall in line with "shipment" data? I can't ever recall NPD issuing a press release saying they needed to alter past data to corrolate with a companys quarterly reports. |
That's because they track the states. Far far easier than the middle east and hard to track parts of Europe.
