Stop Calling the First Significant Day a Win
Stop Calling the First Significant Day a Win
Checking an A/B test until it crosses p < 0.05 can turn a nominal 5 percent false-positive rate into almost 28 percent. I use a seeded simulation to show how large the damage gets and compare the fixes that keep early stopping honest.
The post Stop Calling the First Significant Day a Win appeared first on Towards Data Science.
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