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Possibility, Probability and Proof: On Case Studies, Correlation and Causation in SEO

I wanted to spend a bit today dealing with a pretty big issue that I see regularly in our industry, bickering over the state of research in search engine optimization. Rarely a week goes by where someone doesn’t say something about correlation does not equal causation in response to the mere sight of the word. So today, I’m going to write about 3 types of SEO research we see in our industry quite regularly and what I believe the appropriate response should be… Case Studies This one is actually my pet peeve. We tend to let this one go with a pass nearly every time despite the fact that it is likely the least meaningful SEO research presented. I was particularly drawn to this issue after a series of case studies coming out of Link Research Tools...

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