LSI and Link Popularity - Latent Semantic Idexing...
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Latent Semantic Indexing (LSI) Basics
Let's now touch upon the myth I mentioned before, that if a backlink's
anchor text does not contain your Web site's main keyword, its power is wasted. The concept of latent semantic indexing, which may be more fully implemented by major search engines in the near future, will prove this myth to be false.
Latent semantic indexing can help overcome the "vocabulary mismatch" problem when a human uses a search engine. Individual words do not always provide reliable evidence about the conceptual meaning of a document. For instance, a Web page that is highly relevant to the term "laptop" may never use the term "notebook," however it is clear to a human being that "notebook" is often used as a synonym for "laptop."
While it is beyond the scope of this article to discuss the mathematics
behind LSI, its implications for search algorithms are simple. LSI can
use statistical techniques to create a semantic analysis for any given
query topic. In practice, this means that a page can be considered
relevant for a particular keyword, even if it does not contain that
keyword. For instance, a page that is considered relevant for "laptop" can also be considered relevant for "notebook" even if it does not contain the word "notebook," if LSI determines that "notebook" is semantically related to "laptop."
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