Ethomaz's Dismantling the Myths: Amazon.com's Best Sellers is Not Accurate to the Predict Overall Hardware Sales in US (Checking: Accuracy with Software)

[ethomaz]

kirby007 said:
Just looks like NPD just uses amazon data

Amazon and Walmart are part of NPD since 2012 if O'm not wrong... these are the last two big retail to be part of the tracking system. Before they have a tracking system with ~50% of the US market... today is close it is over 70%.