Keyword Effectiveness Index (KEI) definition

KEI is an acronym for ‘Keyword Effectiveness Index’. The KEI is used to give a numerical value to a keyword based on:

1. Keyword popularity
2. The number of competing websites

The higher the value of the KEI the better they are deemed to be as they represent more searches per website. This can be taken further by measuring the Keyword Opportunity Index (KOI) of the same keyword.

To work out the KEI of your keyword, first you need to find out the number of monthly searches for your keyword. You can find out this information using tools such as Wordtracker or even Google Adwords (x). Next you need to find out the raw competition, which is the number of websites competing for the same keyword (y). To work out the KEI of your keyword use the formula:

x² ÷ y

Any keyword that has monthly searches of less than 1000 can be less reliable than other keywords, as these results can be easily skewed / biased. Check the 3 month history of these keywords to ensure the best results.