Methodology: We calculated each title’s points score based on its position on the respective e-book retailer’s top sellers list, that retailer’s market share, and the average sales ratio between each title in the print book hardcover fiction lists for the past 20 weeks (based on Nielsen BookScan data). Market share was tricky to calculate, especially when, in more than half the cases, Apple wasn’t selling the book, thereby skewing the relative importance of the other retailers for those titles. We have factored this into our calculations to create the first (Pace NYT) e-book bestseller list.
We collected data from all the lists on Tuesday, February 1, 2011. Here are the lists we used:
Apple iBookstore bestseller list–accessed via iPhone iBookstore app, under “Charts”