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You all may be knowing what a keyword actually is, for those who don’t, this is how it is defined.
‘A Keyword is a word that may be put into a search engine to search for a website, or a set of words that may be queried by a user in a search engine to get results related to the particular keyword’
Coming back to the topic, ‘The Keyword Effectiveness Index’ or ‘KEI’ is more or less like a complex calculation relating to the supply and demand ratio of a particular keyword.
Merely by taking a glance over the KEI number of a particluar keyword, you’ll be able to identify the potential the keyword term holds as far as searches and traffic driven is concerned. It is also a really good way to compare the value of your targeted keywords.

The KEI relies on three basic concepts :

1) Its value is directly proportional to the globallocal search volume. I.e. the KEI score increases as the number of searches increases.

2) Its value is inversely proportional to the competition volume of a keyword. I.e. the KEI score of a keyword decreases as the volume of competition of that particular keyword increases. The more the number of sites start targeting a keyword, the faster will its KEI value decrease.

3) Its value is directly proportional to the simultaneous increase in the search and competition volume. This is based on a theory suggesting that if the keyword popularity increases, even though it stays in proportion to its volume of competition, it certainly makes the keyword terms much attractive than with a lesser number of searches even though the search/competition ratio remains constant.

The ‘Keyword Effectiveness Index’ of a particular keyword is used mainly in advanced SEO analysis while analyzing a website’s targeted keywords. Based on the theory of probability calculation and considering KEI, an effective conclusion can be reached upon thus enabling the webmaster/analyzer to effectively predict, search volume directed to the site from that keyword and time that would be taken to rank for a particular keyword.

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