What is 'TF-IDF'?

What is 'TF-IDF'?

Approach: Describe a numerical statistic that reflects word importance in a document.

Term Frequency-Inverse Document Frequency. A weighting factor used in information retrieval and text mining. It increases with the number of times a word appears in a document but is offset by the frequency of the word in the entire corpus.

Follow-up: Why is 'the' usually low in TF-IDF?

Key concepts: term frequency, inverse document frequency, text mining.