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Shimon Sandler has made an excellent post explaining what KEI is. KEI is a component of the initial keyword analysis and is a very important criteria to consider when you are choosing your keywords for your website, and the keyword competitiveness of these keywords. The Keyword Effectiveness Index refers to the ratio of # Searcher per Month over the # of Results per month expressed as a percentage. A quick example, if a certain keyword had 10.000 searches per month and the number of search results is 1,500,000, then the KEI is 0.66%. Obviously, the higher...

