The core technology in our ranking system comes from the academic field of Information Retrieval (IR). The IR community has studied search for almost 50 years. It uses statistical signals of word salience, like word frequency, to rank pages. (See "Modern Information Retrieval: A Brief Overview" for a quick overview of IR technology.) IR gave us a solid foundation, and we have built a tremendous system on top using links, page structure, and many other such innovations.
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Looks like Google just had to answer to this article at SEL http://searchengineland.com/080714-123820.php
certainly helps to reduce the need for extenisve speculation doesn’t it? Most revealing line IMOSimilarly, if you tend to prefer results from a particular shopping site, you will be more likely to get results from that site when you search for products.