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What is LSI and How its work?

This is a discussion on What is LSI and How its work? within the Search Engine Optimization forums, part of the Internet Marketing category; Hello friends, I want to know that What is LSI and How its work..?...

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    Default What is LSI and How its work?

    Hello friends,


    I want to know that What is LSI and How its work..?

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    Senior Member dennis123's Avatar
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    Default Re: What is LSI and How its work..?

    LSI stands for Latent Semantic Indexing. “Semantics” relates to the meaning of words. What exactly LSI does is that it attempts to find the concepts associated with web pages by analyzing how words work in combination with other words. Depending on the context of the document there are terms, which have completely different meanings. LSI may change SERPs.

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    Default Re: What is LSI and How its work..?

    LSI stands for Latent Semantic Indexing. “Semantics” relates to the meaning of words. What exactly LSI does is that it attempts to find the concepts associated with web pages by analyzing how words work in combination with other words. Depending on the context of the document there are terms, which have completely different meanings. LSI may change SERPs.

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    Senior Member RH-Calvin's Avatar
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    Default Re: What is LSI and How its work?

    Latent Semantic Indexing (LSI) is a system used by Google and other major search engines. The contents of a webpage are crawled by a search engine and the most common words and phrases are collated and identified as the keywords for the page.
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    Default Re: What is LSI and How its work?

    Latent Semantic Indexing (LSI) is a mathematical method used to determine the relationship between terms and concepts in content.

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    Default Re: What is LSI and How its work?

    Latent Semantic Indexing (LSI) is a mathematical method used to determine the relationship between terms and concepts in content. The contents of a webpage are crawled by a search engine and the most common words and phrases are collated and identified as the keywords for the page.

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    Default Re: What is LSI and How its work?

    Latent Semantic Indexing (LSI) is a mathematical method used to determine the relationship between terms and concepts in content.


    It starts with creating a “bag of words” representation of the document, where you convert the document into a looong vector that has a position in it for each word in the dictionary, and you just count up the number of times each word occurs in the document. Then you apply tf-idf, which just adjusts the values a bit based on how common place the words (more common words are less significant!)

    After that, it gets a little math-heavy. You perform matrix decomposition in order to find some number (maybe just a couple hundred) of “topic” vectors. You project your tf-idf vectors onto these topic vectors, and you’ve got a shortened vector with much more informative features.
    Think of it as compressing the tf-idf vectors down—if you’re going to compress the vectors effectively, then you need to filter out the noise and identify the information that really best represents the document.

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    Default Re: What is LSI and How its work?

    LSI looks for synonyms related to the title of your page.

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    Default Re: What is LSI and How its work?

    Latent semantic analysis is a technique in natural language processing, in particular distributional semantics, of analyzing relationships between a set of documents and the terms they contain by producing a set of concepts related to the documents and terms.

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    Default Re: What is LSI and How its work?

    Latent Semantic Indexing (LSI) is a computer technology developed in the late 1980s to retrieve precise information from large sets of data. The computers use Singular Value Decomposition process to find the correlation between different terms in a seemingly random set of data. LSI allows search engines to understand your content and its context along with your search intent and its relationship to a specific keyword. As search engines can read your content like humans do, using relevant keywords will improve its chances of getting ranked higher in search results.

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    Default Re: What is LSI and How its work?

    thanks for sharing with us