How the "you might like these products" in webstores is implemented?

Question

Some e-commerce platforms have the suggestion feature where they tell you once you have an item in the basket that "you might like this product as well". Some, like Amazon, rely on the preexisting data on customer behaviour and their feature is called "Customers Who Bought This Item Also Bought" but some seem to suggest by other means. What are these "other means"? What kind of algorithms do they use in webstores for this capability? Select the correct answer from above options JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

They use data mining, and this particular algorithm you're asking about is called the "nearest neighbor" algorithm. Here's a link to an article I wrote on the algorithm (as well as many others). http://www.ibm.com/developerworks/opensource/library/os-weka3/index.html