Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.

  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

2. Making Recommendations > Collaborative Filtering

Collaborative Filtering

You know that the low-tech way to get recommendations for products, movies, or entertaining web sites is to ask your friends. You also know that some of your friends have better “taste” than others, something you’ve learned over time by observing whether they usually like the same things as you. As more and more options become available, it becomes less practical to decide what you want by asking a small group of people, since they may not be aware of all the options. This is why a set of techniques called collaborative filtering was developed.

A collaborative filtering algorithm usually works by searching a large group of people and finding a smaller set with tastes similar to yours. It looks at other things they like and combines them to create a ranked list of suggestions. There are several different ways of deciding which people are similar and combining their choices to make a list; this chapter will cover a few of these.


  

You are currently reading a PREVIEW of this book.

                                                                                                                    

Get instant access to over $1 million worth of books and videos.

  

Start a Free 10-Day Trial


  
  • Safari Books Online
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint