Risk & variance
A real edge still swings wildly in the short run. Understanding variance — and the drawdowns it creates — is what keeps you from quitting a winning strategy at the worst moment.
Variance is the path, edge is the destination
Edge tells you where you end up over thousands of decisions; variance is the bumpy road you take to get there. Even a strong, genuinely +EV strategy will post losing weeks, months, sometimes longer.
Those swings are normal and mathematically guaranteed — not a sign your edge has broken.
Drawdown and the asymmetry of losses
A drawdown is a peak-to-trough fall in your portfolio. Because losses compound, they hurt more than equivalent gains help: lose 50% and you need a 100% gain just to recover.
Keeping drawdowns shallow, through small position sizes, is what makes recovery realistic.
Risk of ruin
Size your positions too large relative to your portfolio and a normal losing streak can wipe you out before your edge ever pays off. Risk of ruin combines edge, variance and position size into one number.
The lever you control is position size: smaller allocations push the risk of ruin toward zero.
Surviving the swings
Decide your sizing and your maximum drawdown in advance, on a calm day. When the inevitable cold streak comes, you follow the plan instead of the panic. Yoseri simulators let you stress-test a strategy across thousands of scenarios before you risk real money.
Theory is nice. Edges pay.
Yoseri does the pricing, edge and portfolio math for you — free to start, no card.