Running Multiple A/B Tests at Once: When Overlap Is Safe
Every experimentation program hits this question within its first few months: test A is running on the homepage, the checkout team wants to launch t…
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Checking your A/B test every morning makes it lie to you
You launch the test on Monday. You check the dashboard each morning, because of course you do. On Thursday it reads p = 0.04, you call it, and you s…
Multi-Armed Bandit Testing: How It Works and When to Use
A multi-armed bandit is an algorithm that decides how to split traffic across several variations while a test is still running, shifting more visito…
How to Choose a Minimum Detectable Effect (MDE)
You have opened your sample-size calculator, entered your baseline conversion rate, kept the defaults for significance and power, and now the calcul…
Underpowered Tests Lie
Last month I audited the statistics inside Mia, my ad-testing agent, and found a 20x error that had never broken anything. No exception, no failed a…
Exit intent that works on mobile, not just desktop
Originally published on my site, arafatcro.dev/guides . You copy the exit-intent snippet, it fires nicely when the cursor heads for the close button…