What is the effect of this transformation if a term occurs in one docu- ment? In every document?

Consider a document-term matrix, where tfij is the frequency of the i

th word

(term) in the jth document and m is the number of documents. Consider

the variable transformation that is defined by

where dfi is the number of documents in which the i

th term appears and is

known as the document frequency of the term. This transformation is

known as the inverse document frequency transformation.



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What is the effect of this transformation if a term occurs in one docu-
ment? In every document?

Computer Science & Information Technology

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