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Tf idf term weight - PowerPoint PPT Presentation

Ranking-based Processing of SQL Queries

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tf= term frequency in doc

RoloDex Model. 16. 6. itemset itemset card. 5. wtf(t,d)=tf(t,d) * idf(t) where idf(t) ( inverse term frequency) = log 2 N/n= total # of docs, n= # of docs containing t. Item. wtf = weightd term frequency. 4. tf= term frequency in doc. 3.

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Tf idf term weight - PowerPoint PPT Presentation

Ranking-based Processing of SQL Queries

tf= term frequency in doc