KEI - Keyword Effectiveness Index.  As defined by Wordtracker: KEI compared the Count result (number of times a keyword has appeared in the Wordtracker data) with the number of competing web pages to pinpoint exactly which keywords are most effective for your campaign.  This means that the higher the KEI, the more popular your keywords [...]

In Keyword Research Part I, I introduced you to Yahoo Search Marketing
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And I also talked about a little keyword research tool I used called Micro Niche Finder that will take the guess work out of [...]