Term weighting is a procedure that takes place during the text indexing process in order to assess the value of each term to the document. Term weighting is the assignment of numerical values to terms that represent their importance in a document in order to improve retrieval effectiveness . Essentially it considers the relative importance of individual words in an information retrieval system, which can improve system effectiveness, since not all the terms in a given document collection are of equal importance. Weighing the terms is the means that enables the retrieval system to determine the importance of a given term in a certain document or a query. It is a crucial component of any information retrieval system, a component that has shown great potential for improving the retrieval effectiveness of an information retrieval system .
The use of word frequency dates back to G. K. Zipf and his well-known law  for word distribution. The law...
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