Correlates the number of term frequency in the HTML source as a factor.
This factor correlates the term frequency (TF) (in the HTML source) with rankings. TF = 1 + log(match count)
The matches counted include any of the relevant hits highlighted by Google in the search results.
You can learn more about the targeted zone for this factor at: https://en.wikipedia.org/wiki/Tf%E2%80%93idf.
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