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The tf-idf weight of a term is the product of its tf weight and its idf weight.
Wt,d = log(1+ tft,d) x log10(N/dft)
Best known weighting scheme in information retrieval
Note: the “-” in tf-idf is a hyphen, not a minus sign!
Alternative names: tf.idf, tf x idf
Increases with the number of occurrences within a document
Increases with the rarity of the term in the collection
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