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Discipline & Risk
Expected Value, Explained
The single mental model that separates traders who think in probabilities from those who think in outcomes.
NoVo Options Trading · 2026
Expected value (EV) is the average outcome of a trade if you took it thousands of times - each result weighted by its probability. The formula is simple: (win probability x average win) minus (loss probability x average loss). A trade is worth taking only if its EV is positive. This one idea reorganizes how you see every decision.
Why win rate alone lies
A strategy that wins 70% of the time sounds great - until you learn the losers are three times the size of the winners, making its EV negative. Meanwhile a strategy that wins only 40% of the time can be highly profitable if the winners dwarf the losers. Win rate is half the equation; the size of wins versus losses is the other half. Profit factor captures the same truth.
Thinking in probabilities
Amateurs judge a trade by its outcome - a winner was "good," a loser was "bad." Professionals judge by the decision: was it a positive-EV bet given what was knowable? A good decision can lose; a bad one can win. Over a large sample, only the EV of your decisions matters. Any single result is noise.
A losing trade can be a great decision. A winning trade can be a terrible one. EV is how you tell them apart.
Why it underpins systematic trading
A machine that scores setups, sizes by conviction, and manages exits mechanically is really just a positive-EV engine executed without emotion. It takes the good bets repeatedly and refuses to let a lucky win or an unlucky loss cloud the process. That is the whole game: find positive expected value, size it so ruin is impossible, and repeat without flinching.
More on this: How Many 0DTE Trades Per Day? Fewer Than You Think · What Is T+1 Settlement? When Trades Actually Settle · What Is Parity? When an Option Trades at Intrinsic Value · Fair Value Gaps, Explained · The Kelly Criterion, Explained · MAE & MFE, Explained
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NoVo is a software tool for market analysis and for executing trades you initiate, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.