One way to compare keywords is to use a keyword effectiveness index, or KEI. What this will do is give you a visual aid that lets you gauge how much success you can expect to have with any given keyword. To construct a keyword effectiveness index you simply need to plot a chart with search volume on the x-axis and either Google PR of the first site returned or total results returned on the y-axis. The x-axis represents benefit and the y-axis represents inherent difficulty to achieve the top spot.You want to optimize for words with low difficulty and high benefit. Otherwise known as the path of least resistance.
KEI IMAGE
The idea is to find a keyword that will result in a point that is as red as possible.
We cannot stress enough how important this is. There are often drastic differences between related keywords and choosing the right words to optimize for can be the difference between success and failure.
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