Calculating Keyword Effectiveness Index (KEI)
In a thread about long tailed vs. short tailed keywords
, one of our members, N.A., suggested:
You should target keywords which have more than 2000 'broad' searches per month AND which have less than 50,000-60,000 'phrase' match results. (use the keyword you get from Google keyword tool and search for the keyword with quotation marks and look at the number of results).
Any keyword with searches below 2000 will not be profitable enough. And any keyword which has results in google above 60000-70000 will be too tough.
Some SEOs get even more sophisticated and calculate the KEI (Keyword Effectiveness Index) for given terms. You can subscribe to software such as Keyword Discovery
that will do analysis for you or you can learn to calculate it yourself. See: http://www.guruofsearch.com/keyword-effectiveness-index
for one approach and several formulas.