Why Your A-B Test Winner Flops in Production

What this episode covers

Episode 40 digs into the 'winner's curse' of A-B testing: why a variant that crushes it in an experiment often fails when rolled out to all users. Lucas and Luna unpack the behavioral cause — novelty effects, seasonal confounds, and Simpson's Paradox — using real examples from ecommerce and SaaS. They explain how to spot a false positive before you ship, and why a holdout group is your only safety net. Plus a short, sincere listener-support moment tied to the show's marketing focus. #A-BTesting #CRO #ConversionRateOptimization #DataScience #ExperimentDesign #NoveltyEffect #SimpsonsParadox #HoldoutGroup #FalsePositive #StatisticalSignificance #MarketingStrategy #DigitalMarketing #Ecommerce #SaaS #FexingoBusiness #BusinessPodcast #LucasAndLuna #ProductExperimentation Keep every episode free: buymeacoffee.com/fexingo

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Frequently Asked Questions

How long is this episode of Conversion Rate Optimization with Fexingo: A/B Testing, Landing Pages, and CRO Strategy?

This episode is 8 minutes long.

When was this Conversion Rate Optimization with Fexingo: A/B Testing, Landing Pages, and CRO Strategy episode published?

This episode was published on June 9, 2026.

What is this episode about?

Episode 40 digs into the 'winner's curse' of A-B testing: why a variant that crushes it in an experiment often fails when rolled out to all users. Lucas and Luna unpack the behavioral cause — novelty effects, seasonal confounds, and Simpson's...

Can I download this Conversion Rate Optimization with Fexingo: A/B Testing, Landing Pages, and CRO Strategy episode?

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