What is Term-Frequency?
Term Frequency (TF)
Term frequency (TF) often used in Text Mining, NLP and Information Retrieval tells you how frequently a term occurs in a document. In the context natural language, terms correspond to words or phrases. Since every document is different in length, it is possible that a term would appear more often in longer documents than shorter ones. Thus, term frequency is often divided by the the total number of terms in the document as a way of normalization.
TF(t) = (Number of times term t appears in a document) / (Total number of terms in the document).
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