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This is actually the first question where it felt worth for me to calculate the odds with the Kelly criterion (p-(1-p)/b). I also noticed how this is a pain in the ass to do. First I thought my odds are 110/100 since this is the ratio of how much I loose vs. how much I regain. But actually it's 10/100. Only noticed since it gave me positive percentages for my bankroll even when it was obvious that the expected value was negative. Another complication is how your bet size impacts the odds. Would be nice if there was a tool that integrated with manifold. Then the only thing needed would be the URL of the market/a description of the market state, my estimated %-chance and my bankroll. That would really satisfy the perfectionist within me.
@TassiloNeubauer YES! someone has already done the obvious: https://github.com/bcongdon/PyManifold has a kellycalculator.