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Re:Eric Ries: Vanity Metrics vs. Actionable Metrics by davidbnewquist on Tuesday May 19, 2009 @06:36PM (#617758)
Despite seeming a little jargon heavy, I was able to distill out few useful ideas.

For example, say you're considering a cool new CAPTCHA for your registration page. The article would advise doing an "A/B split test" before phasing out the old CAPTCHA.

Such a test would involve creating an alternate registration page with the new CAPTCHA, and randomly directing x% of users to the alternate page. You could then obtain registration completion % from both groups, which would drive your decision to switch to fully switch to the new CAPTCHA.

Re:Eric Ries: Vanity Metrics vs. Actionable Metrics by jfarmer on Tuesday May 19, 2009 @06:48PM (#617772)
Why is cohort analysis a buzzword? It's a specific technique for doing longitudinal studies.