The Keyword Effectiveness Index ( KEI )

When launching an online marketing campaign or a search engine optimization the keyword effectiveness index will facilitate the measure of competitiveness. Now that you've found possibly 100's of keywords that would fit the description of your products or services, and could drive a massive targeted traffic on your website, a lookup to the competition on each of those terms is essential.

Three axioms are the basement of the KEI :

There are many possibilities to satisfy those three axioms. The equation used by Wordtracker is the most used over the online marketer community. The London based company WordTracker is a reference for keyword research of search engine marketing professionals and search engine optimizers. This company has access to data within very large meta crawlers, and covers up to 150 million of searches per month.

The chosen formula is KEI = (P^2/C), where KEI is the square of the popularity of the keyword and divided by its competitiveness. This formula satisfies all the 3 axioms:

  1. If P increases, P^2 increases and hence KEI increases. Hence, Axiom 1 is satisfied.
  2. If C increases, KEI decreases, Axiom 2 is satisfied.
  3. If P and C both increase such that P/C is the same as before, KEI increases.
Other researches on the Overture network, 7search and Google are necessary to confirm that the results, your keyword effectiveness index is most accurate. A good search engine marketing campaign, whether you decide to go towards pay per click or SEO should always start with keyword research and a measure of competitiveness.

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