File: ~/Desktop/Performance Books/The Success Equation ...pdf · Tradition: decision science / luck-vs-skill
Stance: Ally — the intellectual basis of "rule out chance" (backs the value model)
Core claim
Outcomes sit on a continuum from all-luck to all-skill; most real activities mix both, and untangling them is the prerequisite to learning anything from results. The more skilled the field, the more luck decides outcomes (the paradox of skill), and results revert to the mean at a rate set by the luck/skill ratio.
Grounded
- Title: "Untangling Skill and Luck in Business, Sports, and Investing."
- "the continuum from all-luck to all-skill … the paradox of skill and what determines the rate of reversion to the mean."
- "statistical reasoning is hard, and we start to view the past as something that was inevitable" — the hindsight that makes survivorship stories feel like causation.
Contrast / use
This is the book under "our entire purpose is to rule out chance" ([[value-model-variance-explained]]). Variance-explained is placing performance on the luck–skill continuum and measuring how much is skill (real, repeatable) vs luck. Reversion-to-the-mean is why a single good quarter isn't evidence — you need measurement to separate signal from noise. Complements Halo Effect (#17) and Noise (#19).
Where it plugs in
value-model-variance-explained.md (rule-out-chance citation); Part I·b (survivorship). Acquired ✓.