Or, really, the fourth book, Breaking Dawn. Want to know why? Because I own all of Douglas Adams’s books*. Yip. Any clue what the connection could be? I’ve got one idea, but I’m not poisoning the discussion.
It specifically lists So Long, and Thanks for All the Fish and The Hitchhiker’s Guide to the Galaxy*, to be specific.
IMO their algorithm is crap - but the connection is, if I recall correctly, simply that others who bought these books, also bought those books. I get some pretty bizarre recommendations sometimes.
Ew, thanks for the warning… I’m pretty sure Amazon knows I have the Hitchhiker books, but it’s never recommended Twilight to me. Maybe it’s lurking in there somewhere, just hiding behind a few hundred textbooks, science fiction, and Discworld.
I work on software like this (not for Amazon but it’s similar). In most cases we never look at the attributes of the books (or shoes, or TV shows, or DVDs). The correlations are based on users preference. In all likelihood you were recommended Book A because there’s a statistical correlation between people who purchased that and Book B. It can lead to some interesting recommendations when you are talking about obscure titles, but in this case I bet there is a lot of data.
Retailers can make the algorithms fancier than that, but you end up working against your best interests. The results that produce the best ROI are to let the users’ actions speak for themselves.
This is the key: The point of a recommendation algorithm is to generate revenue for the organization running the algorithm, not to produce the best possible recommendations. It’s probably possible to do better than Amazon is doing right now, but the folks who find such an algorithm and figure out how to make it run sufficiently quickly on Amazon’s database will be producing doctoral dissertation-quality work.
Funny, in the “Amazon recommendations that make no freaking sense” thread, the OP is asking about the connection between Pride & Prejudice and zombies, circa 2006.