TF is given by TFD , t , and it denotes frequency of term t in document D. IDF is given by IDFt = log ( N/dft ) , where N is the number of documents in the collection , and dft is the number of documents containing the term t. ( Salton and Yang , 1973 ) proposed the combination of TF and IDF as weighting schemes , and it has been shown that their product gave better performance .
on the specification of term values in automatic indexingquot
G Salton C S Yang
The importance of each term is assumed to be inversely proportional to the number of documents that contain that term . TF is given by TFD , t , and it denotes frequency of term t in document D. IDF is given by IDFt = log ( N/dft ) , where N is the number of documents in the collection , and dft is the number of documents containing the term t. ( Salton and Yang , 1973 ) proposed the combination of TF and IDF as weighting schemes , and it has been shown that their product gave better performance . Thus , the weight of each term/root in a document is given by wD , t = TFD , t * IDFt .
TF is given by TFD , t , and it denotes frequency of term t in document D. IDF is given by IDFt = log ( N/dft ) , where N is the number of documents in the collection , and dft is the number of documents containing the term t. ( @@CITATION ) proposed the combination of TF and IDF as weighting schemes , and it has been shown that their product gave better performance .