# Stop vs noise — lesson

Gym heading: Sizing the order. Written before the code (Sep 7 2026); rule revised the same day (the band of the last N bars became the last completed swing; then one confirming bar each side and a 20-bar swing lookback, after a 12-bar lookback fell back to the extreme on 28% of drill reps; then the swing must sit on the stop's side of the entry). The teach screen shows this text; the answer key implements the rule in it and nothing else. Distances are in M everywhere.

Persistent header: **"Training your eye for the stop that only a real move can hit."**

## Before you size

- **Noise** — the distance a bar travels without meaning anything. It is measured, not felt: the median high-to-low range of the last N bars is one unit of it. A doji is a bar that went that far and came back to where it started.
- **The last completed swing** — for a long, the most recent swing low below the entry: a bar whose low is lower than the lows of the bar on either side of it, and lower than the entry. For a short, the most recent swing high above the entry, mirrored. Swings on the wrong side of the entry don't count. Looked for over the last 20 bars only, so a runaway leg doesn't reach back forever; if no such swing sits inside the lookback, the lowest low (highest high) of those 20 bars stands in. Price coming back to a completed swing is routine. Going through it is not.
- **The stop** — a distance from the entry, measured in M. Points mean nothing: 14 points is a third of the noise one night and three times the noise the next.
- **The rule** — a stop survives the noise when both hold:
  1. its distance from the entry is at least **k × the median bar range of the last N bars**, and
  2. it sits **beyond the last completed swing**: below the swing low for a long, above the swing high for a short.
  Here k = 1.5 and N = 12; the swing is looked for over the last 20 bars. Fail either one and the first doji can take it.
- **Why it matters at the trade** — a stop inside the noise is a coin flip against a doji: you can be right about direction and still lose. Last night's 14-point stop sat inside a 20-point pin, 0.2 M in a 0.3 M range. The market didn't have to move to hit it. It only had to breathe.
- **What it doesn't say** — a stop that survives the noise is not a good trade. It only says the exit is outside the wiggle. Whether the target is reachable is Runway, a different module.
- **M** — the median high-to-low range of the last 20 bars. Every distance here is in M. The number for the current chart is on the screen.
- **Confidence is a number** — Low means 40%, Medium 65%, High 90% that your call is right. Scored Brier-style: sure and wrong costs 0.81, unsure and wrong costs 0.16, sure and right costs 0.01. Being certain is as expensive as being wrong.

## The read

Three things, all in M: the recent bar ranges (how big is a normal bar right now), how far the last completed swing sits from the entry, and the proposed stop's distance from the entry. Then the question: is the stop past both?

## The rep

A chart with a proposed entry at the last close and a stop drawn on it. The last completed swing is marked. M is stated. The question, in full: **"Long (or short) from the last close, stop at the red line. Does this stop survive the noise?"** Yes or No, with a confidence.

## The reveal

The stop distance in M, the swing's distance in M and which side of it the stop sits, k × the median range in M, the verdict, and one takeaway line. Templates:

- Survivor: **"{stop} M stop beyond the swing — noise can't reach it; only a real move can."**
- Not a survivor, short of the swing: **"{stop} M stop short of the swing at {swing} M — the first doji takes it."**
- Not a survivor, beyond the swing but under the noise: **"{stop} M stop clears the swing but not {noise} M of noise — a normal bar reaches it."**

Every rep ends on one of these three lines. Each is a decision: this stop goes on as drawn, or it moves, or the trade doesn't exist at that size.

## Answer key

`survives = (stopDistance >= k × median(range of last N bars)) AND (stop price is beyond the last completed swing on the stop's side)`. Swing: a low lower than the bar on either side and below the entry (long), or a high higher than the bar on either side and above the entry (short), the most recent one within the last 20 bars; swings on the wrong side of the entry are ignored; otherwise the extreme of those 20 bars. About half the reps survive (config). Some stops sit within a few percent of the threshold on purpose; the reveal shows the numbers either way.