The Silent Denominator
Reconstruct the denominator behind a success story to reduce survivorship bias.
Success stories need a starting line. The Trap If you study only the people, products, or customers that survived, the failures vanish from the evidence. That makes patterns among winners look more universal than they are. The Mechanism The selection filter is applied after the outcome. You are not comparing users of a practice with non-users; you are comparing visible winners with each other. That is why survivorship bias can make weak practices look strong and strong practices look more certain than they are. The Fix Move the sample definition back to the moment before the outcome was known. Count…
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