KEI and Keyword Relevancy
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Overview: This paper from SEMphonic describes the very first task that faces beginning Search Engine marketer is deciding what search terms are worth considering. How to decide what search terms are worth considering?, the answer is KEI, KEI stands for Keyword Effectiveness Indicator and was invented by Sumantra Roy. This measure is part of WordTracker (also embedded in WebPosition Gold) and is designed to provide a comparative measure of word relevancy.