2011
DOI: 10.5860/lrts.55n4.239
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Book Review: Introduction to Modern Information Retrieval

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Cited by 6 publications
(2 citation statements)
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“… and is the proportion of the occurrence frequency of subject and to the sum, and is the degree of difference between subject and ; its value is calculated by Formula 2. Furthermore, is Salton's cosine similarity between the two disciplines [ 55 ]; its value is calculated by Formula 3. Formula 3 calculates the similarity of subjects based on the number of co-occurrences between one subject and the other disciplines as well as the similarity between two associated disciplines.…”
Section: Methodsmentioning
confidence: 99%
“… and is the proportion of the occurrence frequency of subject and to the sum, and is the degree of difference between subject and ; its value is calculated by Formula 2. Furthermore, is Salton's cosine similarity between the two disciplines [ 55 ]; its value is calculated by Formula 3. Formula 3 calculates the similarity of subjects based on the number of co-occurrences between one subject and the other disciplines as well as the similarity between two associated disciplines.…”
Section: Methodsmentioning
confidence: 99%
“…Previous studies have found that these two features outperform when used for similar classification tasks [15,16]. Finally, we used tf-idf (short for term frequency-inverse document frequency) to calculate the weight for each term to obtain terms' vector [17]. In a tf-idf scheme, the basic vocabulary is formed by choosing the number of times a term appears in the document collection, here called term frequency (tf).…”
Section: Features Extractionmentioning
confidence: 99%