Dec broadening
A widening range tilted down: the 100-bar ceiling falls over 20 bars and the floor falls faster.
It takes the highest and lowest close of the last 100 one-minute bars and measures how much each has changed over the last 20 bars, as a percent. It marks a bar when the ceiling has fallen by more than eps (0.05 percent by default) and the floor has fallen faster than the ceiling, so the range opens toward the bottom. The lines are rolling extremes of closes, not trendlines through swing points, so the test uses those numbers rather than the shape a trader would draw.
How to read it
- Markers sit on the candles. Each run of consecutive markers is one episode of the range widening downward.
- On the September 2026 SPY sample, defaults gave 19 episodes, about one a day, each about 8 bars long.
- The markers describe the range's shape at that moment. They do not say which way price breaks out next.
What it outputs
- Descending broadening
- True on each bar where the 100-bar ceiling fell more than eps over 20 bars and the floor fell faster than the ceiling. Nothing is drawn on other bars.
When it fires
Fires on each bar where the ceiling has fallen more than eps over the last 20 bars and the floor has fallen faster than the ceiling, a range opening downward. A run is one episode; its first marker is the bar the condition first held.
Settings
- eps
- Minimum percent fall of the 100-bar ceiling over 20 bars (0.05 is about 38 cents near SPY's 765). Raising it thins the markers; lowering it admits smaller falls. Below 0 the ceiling may rise by up to that much and still count.
Pitfalls
- The lines are the highest and lowest closes of 100 bars, so they step rather than slope and ignore intrabar highs and lows.
- The ceiling-above-floor test fails only when all 100 closes are equal, so only the two slope tests filter bars.
- Rare at defaults, marking about 0.7 percent of bars. The floor has no threshold of its own; it only has to fall faster than the ceiling.