Natural Search Engine Optimization

Figure 1-10. Optimum keyphrase length—query length versus conversion rates

Figure 1-10. Optimum keyphrase length—query length versus conversion rates

Oneupweb. 2005. "How Keyword Length Affects Conversion Rates."

http://www.oneupweb.com (accessed April 14, 2008), 2.

Pasca, M. "Organizing and Searching the World Wide Web of Facts-Step Two: Harnessing the Wisdom of the Crowds."

In WWW 2007 (Banff, Alberta, Canada: May 8–12, 2007), 101–110. Google search statistics.