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Subject [CONF] Apache Lucene Mahout > TF-IDF - Term Frequency-Inverse Document Frequency
Date Sat, 09 Jan 2010 14:55:00 GMT
Space: Apache Lucene Mahout (
Page: TF-IDF - Term Frequency-Inverse Document Frequency (

Added by David Stuart:
{excerpt}Is a weight measure often used in information retrieval and text mining. This weight
is a statistical measure used to evaluate how important a word is to a document in a collection
or corpus. The importance increases proportionally to the number of times a word appears in
the document but is offset by the frequency of the word in the corpus.{excerpt} In other words
if a term/word appears lots in a document but also appears lots in the corpus/collection as
a whole it will get a lower score. An example of this would be "the", "and", "it" but depending
on your source material it maybe other words that are very common to the source matter.

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