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Ashley Stirrup

text published 2026-07-22 · Open on LinkedIn ↗

Fanatics, UPS, and DoorDash all prove the same thing about testing. The new edition of The Experimentation Edge newsletter rounds up my conversations with the experimentation leaders at all five: Medha U., David Massey, MFA, and Ilya Izrailevsky. The pattern across every program: put a hard number on the wins, count the losses you prevented, and replicate before you celebrate. That discipline turned one UPS checkout test into a program worth over $500 million, and caught a false positive at Fanatics that 95% significance almost let through. If you need to prove experimentation pays in numbers your CFO recognizes, read the full edition below to learn more. Go follow/subscribe the podcast!

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