The data was collected by crawling Amazon website and contains product metadata and review information about 548,552 different products (Books, music CDs, DVDs and VHS video tapes).

For each product the following information is available:

• Title

• Salesrank

• List of similar products (that get co-purchased with the current product)

• Detailed product categorization

• Product reviews: time, customer, rating, number of votes, number of people that found the review helpful

The data was collected in summer 2006.