Search
Most Popular Articles
- Discussion of the Human Body Defense System
- The story of the 12 animals zodiac in China
- How to Balance Your Body to Get Pregnant
- Eating Junk Food -- The Hidden Price
- How To Stop Your Cat Scratching - Get Rid Of Those Fleas
- Ski Boots -- Testing 1, 2, 3
- Wear it Up or Wear it Down?
- Cat Care, Cat Products and Cat Diseases
- Choosing a Cell Phone
- Artificial Satellite Types
What is LSI
 Category |
: Site Promotion |
 Times Read |
: 43 |
 Date |
: 13 March 2008 16:15 |
by: Rakesh Ojha
What is Latent Semantic Indexing or LSI ?
Latent Semantic Indexing or LSI has changed the world of search engine optimization. One fine morning, SEO experts found that most of their best ranking sites on Google were in jeopardy. Google has simply updated its crawler-program to accommodate LSI and has moved towards a more relevant rating list!
LSI is a methodology involving statistical probability and correlation that helps deducing the semantic distance between words. Its obviously a complex methodology but can be easily applied to understand the relation between certain words in a paragraph or in a document. This methodology is being used while indexing a page in the search engines database.
Delving deeper, LSI is concerned not only with studying a document for keywords and listing it in the database, but also with studying a collection of documents and recognizing and identifying the words that are common between these documents. This way it can conclude on the semantic relation between the words being used in these documents. The process then finds out which other documents include or makes use of these semantically close words. The resultant documents are indexed to be related or closely relevant to a context, according to latent semantic indexing.
LSI regards the documents with certain proportion of words being used frequently to be semantically close. If there are fewer words common among documents, they are supposed to be semantically distant. Therefore, LSI introduces interdependence of measure and it rates the relevance of any document on a scale of 0 to 1. Unlike regular keyword searches, LSI can acknowledge the measure of how close is a document to another or how relevant is a credential to a particular context.
Lets consider an example here. In a document that discusses Stephen Covey and his preaching, words such as effective, habits, interdependence, independence, synergic, paradigm, continuum, public victory, private victory, circle of influence and so on would be found frequently. Once the search engine indexing tool that uses the LSI technique recognizes these commonly-used words from a given set of documents, it can find other documents or Web pages on the net that contains the same set of keywords in almost similar frequency and index them in the database beside the relevant context (Stephen Covey and his preaching) that it leads to.
Now compare this simple method with a human brains approach to search a context. If you are given a set of document and asked to locate the ones that discuss a particular context, what will you do? Anyone will try to find out the things in common in the sample context and use the observation to compare the rest of the documents to classify them. This intelligence has been added to the lifeless crawler-software or computer technology through the LSI technology.
Quite obviously, the LSI algorithm doesnt understand anything about the meaning of a word in a document. It just reads through the pattern of the usage of particular words and calculates the correlation of their occurrence and hence their correlation with a particular context. Lets get into the practical side of it, that is, how it is applied to a search engine technique.
About The Author
Rakesh Ojha is a successful Internet marketer utilizing both pay-per-click marketing and search engine optimization to increase website traffic. To learn more, visit http://www.sem.mosaic-service.com.
vikas@mosaic-service.com
Random Article 1 |
Random Article 2 |
by: Chesa Keane Finally, after the hard-core efforts that are directly related to generating traffic to your website, you next step is to develop a strategy that creates follow-on, long-term traffic. Several methods exist for this Tier III strategy: - Taking the large list of anci |
by: Nick Usborne Perhaps the simplest of all the lessons I have learned about writing for search engines is to keep my pages simple. That is to say, whether I am thinking about my readers or about Google, there is a huge advantage to keeping most of your pages confined to a single top |
Random Article 3 |
Random Article 4 |
by: Derek Croote If you have ever been in an industry with long established, big name companies then you know it is hard to beat them in the search engine rankings. So you go to their pages to see how they are ranking so high, but they are not using the techniques you were told to use |
by: Robin Dary Finding the right keywords to choose for your pay-per-click campaign sounds easy, doesnt it? My site sells hiking boots Ill buy the phrase hiking boots or my site focuses on computer repair Ill buy the term computer repair. Well, those are two very popular search te |