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Originally Posted by pwalker8
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He does reference it, to point out what it misses. Most of the numbers Data Guy cites come from his
Bookstat service, which was founded in large part to address the holes in Bookscan's tracking; most notably it certainly does at least attempt to cover ebook sales via its scraping methodology.
It's certainly legitimate to discuss how accurate his numbers are, but it's a very different system from the Bookscan one that Scalzi is criticizing.