Insights

Insights from Vectopian — quantitative trading, algorithmic systems, technology, research, and investing.

The Kelly Criterion: how much to bet, and what over-betting costs you

· risk, position-sizing, kelly, mathematics, compounding

A good signal tells you what to buy. It never tells you how much. Kelly answers that second question, with the proof worked out step by step and an interactive simulation showing how the same winning bet destroys a bankroll when you size it too big.

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