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(exact match count)
The matches counted include any of the relevant hits highlighted by Google in the search results that exactly match the whole content of the zone.
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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