Keyword Effectiveness Indexing is based on the method of selecting keyword where the search volume is more and number of competitor is less. It’s a formula where we can get most effective keyword for better and easer search engine ranking. The higher the KEI, the more popular the keywords are, and the less competition they have, which means they have a better chance of getting to the top.
The KEI compares the number of searches for a keyword with the number of search results to pinpoint which keywords are most effective for your campaign.
Suppose the number of searches for a keyword is 550 per month and Google displays 214,234 results for that keyword. Then the ratio between the popularity and competitiveness for that keyword is 550 divided by 255,234. In this case, the KEI is 9.794.
Sumantra Roy, a Search Engine Positioning specialist from 1stSearchRanking.com has invented the term and applied by word tracker.