What is WDF*IDF?

Wdf*Idf is A formula that uses two factors to analyze articles, the IDF and WDF. WDF is short for  “within document frequency” and describes the frequency of a word within a document. IDF stands for “inverse document frequency” and is a measure of how popular a keyword is on other related sites. IDF is like a popularity rating.

From Simba’s SEO Dictionary

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