| KEI stand for Keyword Effectiveness Index, which measures how effective a keyword is for your web site.
It compares the number of search for a keyword (popularity) with the number of search results (competitiveness) to identify which keywords are the most effective for your campaign. The higher the KEI value the more popular the keywords are and the less emulation they have. So the better chance they can get into the top position.
The KEI is calculated as follows:
(count ^ 1/3 * eng_weight * pos_weight ) / 10,000
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