What a losing streak proves
Nothing, almost always. That is the short version, and the arithmetic behind it is worth internalising because it is the difference between sitting through an ordinary bad patch and abandoning a working method at the worst possible moment.
Take a method that wins forty per cent of its trades. The chance of five losses in a row at any given point is about eight per cent — which sounds rare until you notice you will pass a few hundred such points a year. Over two hundred trades, a run of six or seven losses is not unlikely; it is close to expected. The streak is a property of the distribution, not a signal about the market.
What makes this hard is that a streak arrives with a story attached. There is always a plausible narrative — the regime changed, volatility fell, the edge is crowded — and the narrative is available whether or not anything actually changed. Human pattern-matching does not distinguish between a real regime shift and six coin flips, and it produces the same confident explanation for both.
So the question worth asking is not "is this streak unusual" but "is this streak unusual GIVEN my distribution". If your longest historical run was eight and you are at five, you are inside your own normal range and there is nothing to explain. If you are at fourteen and your worst was eight, that is genuinely outside and worth investigating — not by feel, but because the number left the range.
The practical rule is to define, in advance, what would make you stop. A number of consecutive losses beyond your historical worst, or a drawdown beyond a stated level, or a specified number of trades with expectancy below zero. Deciding that while calm turns a panic into a procedure, and it is the same mechanism as every other rule in this curriculum: settle it before you need it.
What to take away
- Streaks are a property of the distribution, not a message from the market.
- Ask whether the run is unusual given YOUR history, not whether it feels unusual.
- Define the stop-trading trigger in advance, as a number.
Where it goes wrong
- Changing the method mid-streak because a plausible story presented itself.
- Having no idea what your longest historical losing run was.
- Deciding "this is different" while inside the drawdown.
This chapter, measured against your own trades
In the app the same chapter ends in your figures rather than an example: how often you did the thing it describes, over your last ninety days. You pick one change to make, and Evidence checks afterwards whether it actually changed — from your journal, arithmetic, no opinion involved. Questions you get wrong come back a week later and again a month after that.
Open the free plan →Check that it stuck
Answers shown — in the app these are asked before you see them, and the ones you get wrong come back after a week.