Kindle Statistics: Better Not Tell You Now
Sunday, July 13th, 2008
Kindle sales have doubled, or so Amazon would like to have you believe. A recent Time story reported the following:
According to a source at Amazon, “on a title-by-title basis, of the 130,000 titles available on Kindle and in physical form, Kindle sales now make up over 12% of sales for those titles.”
In late May at the D: All Things Digital Conference, Tim O’Reilly reported Amazon CEO Jeff Bezos saying that “kindle sales represent 6% of all Amazon sales for the 125,000 titles that are available on kindle.”
The problem is that these percentages are delivered in a vacuum. There is no indication as to true sales figures. Here’s the issue in a nutshell for those who are statistically challenged.
Let’s say the the 6% figure was based on 1,o00,000 unit sales. That means Kindle sales accounted for 60,000 units. The 12% figure could be based on another time period where unit sales were, say, 800,000. 12% of 800,000 is 96,000 unit sales. So while the percentage of sales rose 100% from 6% t0 12%, actual unit sales only rose 60% from 60,000 to 96,000.
For what time period is each percentage based? Is the 12% figure cumulative? (If so, the June percentage would have to be massive!) Are these based on revenue or unit sales? These are just the basic questions. Never mind the more detailed analysis of unit sales per Kindle, repeat Kindle sales and median channel sales percentage.

It’s hard to believe that investors are willing to take this type of sales obfuscation. We still don’t know how many Kindles were sold! Oh, they were sold out, but it’s a real easy marketing trick to create buzz by selling out a small line of inventory.
You have to ask yourself, why won’t Amazon actually divulge any of the sales data. If it were as great as they make it seem wouldn’t they be shouting it from the rooftops Tarzan style?
Credit Tim O’Reilly and Time’s Josh Quittner for not blindly reporting these ‘figures’ as a success. In particular, I enjoyed Quittner’s opening volley.
Is the Kindle starting to catch fire with consumers? From the Department of Inscrutable Data Points comes word that e-book sales for Amazon’s Kindle — its digital reading device-have doubled during the past two months. Kind of, sort of, maybe.
Others have been less rigorous in their analysis, seeming to trust Amazon on faith and hoping that another iPod like success story is in the making. Convince me Amazon! Just show us the numbers.
Textbook Torrents is using 
When do you read? Seriously, with all the things competing for my time I often find it difficult to sit down and read, hence the recent brownout in this blog. Sure, I could have posted some other small bits of news or observation but I still feel that the main reason why you’d read the Used Books Blog is for the book reviews. And I’m a big proponent of quality over quantity, so I’m not going to just go back in time and write paragraph reviews of the hundreds (thousands?) of books I’ve read in the course of my life.