Outcome bias: judging a single trade by how it ended
Posted: Sat Oct 31, 2026 8:11 pm
A trade follows the rules and loses. Another breaks the rules and wins. Which one was the better decision?
Outcome bias treats results as proof of quality. The rule-breaking winner gets repeated, and the rule-following loser gets doubted. Over time, behaviour drifts toward whatever happened to work recently.
In a high-variance activity like scalping, single outcomes carry little information. A sound setup with a 55 percent win rate loses 45 times out of 100. A poor one can still win a few in a row.
The more useful question is whether the process was followed. Scoring each trade on execution quality, independent of profit or loss, separates the two.
Over a hundred trades, a high process score with mediocre results suggests bad luck or a weak strategy worth reviewing. A low process score with good results suggests that profits are luck.
Staying focused on process is how skill gets built when feedback is noisy.
Do you grade your trades on execution separately from the result?
Outcome bias treats results as proof of quality. The rule-breaking winner gets repeated, and the rule-following loser gets doubted. Over time, behaviour drifts toward whatever happened to work recently.
In a high-variance activity like scalping, single outcomes carry little information. A sound setup with a 55 percent win rate loses 45 times out of 100. A poor one can still win a few in a row.
The more useful question is whether the process was followed. Scoring each trade on execution quality, independent of profit or loss, separates the two.
Over a hundred trades, a high process score with mediocre results suggests bad luck or a weak strategy worth reviewing. A low process score with good results suggests that profits are luck.
Staying focused on process is how skill gets built when feedback is noisy.
Do you grade your trades on execution separately from the result?