Which PPC metrics matter? Lessons from half a million keywords

Original Post: http://feeds.marketingland.com/~r/mktingland/~3/Sb-VDIlak7E/ppc-metrics-matter-lessons-half-million-keywords-229846

Columnist Jacob Baadsgaard shares insights from a study looking into how various paid search metrics correlate with return on investment (ROI).

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