Fisher's exact test explains a popular metric in information retrieval

26 Feb 2020 Paul Sheridan Mikael Onsjö

Term frequency-inverse document frequency, or tf-idf for short, is a numerical measure that is widely used in information retrieval to quantify the importance of a term of interest in one out of many documents. While tf-idf was originally proposed as a heuristic, much work has been devoted over the years to placing it on a solid theoretical foundation... (read more)

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