Unit 4 · Level 2 · The Trader's Journal
Expectancy: your real score
Expectancy = (win rate × average win) − (loss rate × average loss). It's what an average trade of yours EARNS. Positive expectancy repeated = wealth. Negative expectancy repeated = slow-motion donation. Win rate alone tells you nothing.
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What you get asked
System A: wins 80% of the time, +0.5R wins, −3R losses. Its expectancy?
A polished losing machine. 0.4 − 0.6 = −0.2R. Eighty percent win rate, guaranteed ruin. This single example destroys the beginner's obsession with being right.
System B: wins 35% of the time, +3R wins, −1R losses. Expectancy?
A quiet money machine. 1.05 − 0.65 = +0.4R. Wrong twice as often as right, profitable forever. Losing well is a skill; expectancy is its measurement.
Expectancy only becomes trustworthy after a decent ___ of journaled trades; one week proves nothing.
Thirty-plus trades minimum before the number means much. Small samples are where luck cosplays as skill.
Your journal shows +0.3R expectancy over 60 trades, but this WEEK you lost 4 in a row. What's true?
A 35%-win system hits 4 losses in a row constantly. It's MATH, not failure. Traders who understand this survive the streaks that break everyone else. 🐜
The rest of this unit
Journaling, expectancy, the pre-trade checklist, and the weekly review: how skill compounds.