Here&#x27;s a great article about how Optimizely gets it wrong: <a href="http:&#x2F;&#x2F;dataorigami.net&#x2F;blogs&#x2F;napkin-folding&#x2F;17543303-the-binary-problem-and-the-continuous-problem-in-a-b-testing" rel="nofollow">http:&#x2F;&#x2F;dataorigami.net&#x2F;blogs&#x2F;napkin-folding&#x2F;17543303-the-bin...</a><p>There are _many_ offenders. I&#x27;ve yet to see a commercial tool that gets it right.<p>Tragically, the revamp by Optimizely neglects the straightforward Bayesian solution and uses a more fragile and complex sequential technique.