Google Optimize: "Calculated Conversion Rate" contradicting "Probability to be Best"

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I'm seeing some strange things on a currently running experiment.

Google optimize reporting

  • The Observed Conversion Rate is noticeably higher on the Original, however Optimize's analysis is that the variant is more likely to be best. What should I trust here?
  • The Modeled Conversion Rate seems also way off, with a median CR of 1.2% (original) and 1.3% (variant). Why would the model overshoot reality so much?

Thanks for your guidance!

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