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Originally Posted by AnemicOak
I don't know how AE gets there data, but some thoughts...
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They go into some depth as to how they collect data in the report. Basically they have taken a snapshots of daily sales and the best-seller list on Amazon.com then drew an average from the data. They have also filtered out authors who make less than $10000 a year, which leaves about 5% of authors. So they are looking at sales of authors who are selling consistently, and filtering flashes in the data that do not reappear.