The search engines are getting smarter than ever and they have become so complex that not even their own engineers can predict the outcome of the search results. Recently, the major search engines especially Google adopted what is called Latent Semantic Indexing (LSI) / Latent Semantic Analysis (LSA) to determine the overall theme of a website. LSI is defined as follows:
Latent semantic analysis (LSA) is a technique in natural language processing, in particular in vectorial semantics, patented in 1988 [1] by Scott Deerwester, Susan Dumais, George Furnas, Richard Harshman, Thomas Landauer, Karen Lochbaum and Lynn Streeter. In the context of its application to information retrieval, it is sometimes called latent semantic indexing (LSI) - http://www.cs.utk.edu/~lsi/
LSA uses a term-document matrix which describes the occurrences of terms in documents; it is a sparse matrix whose rows correspond to documents and whose columns correspond to terms, typically stemmed words that appear in the documents. A typical example of the weighting of the elements of the matrix is tf-idf (term frequency–inverse document frequency): the element of the matrix is proportional to the number of times the terms appear in each document, where rare terms are up weighted to reflect their relative importance.
This matrix is common to standard semantic models as well (though it is not necessarily explicitly expressed as a matrix, since the mathematical properties of matrix are not always used).
What does all of this mean in English? Well, it’s pretty simple for the human brain to comprehend, but complicated to approximate mathematically. Essentially, what all of this means for the average site builder is that instead of thinking exclusively in terms of niches and whole pages based on single keywords, you should think more about organizing whole thematic relationships in contextual hierarchies sometimes called inverted pyramids, Silos or Matrices? Pages and sites should contain thematically related words and subdivisions rather than being completely keyword centric and the linking in general should flow from general to specific.
Confused? Well, you don’t have to…
Click here to get the LSI report today and have it all clarified.
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