Candlestick formation · Bullish
What is it, in one line
A hammer with an unusually long lower wick.
Bullish · 1 candle · verdict: rule and thresholds below
A hammer with an unusually long lower wick. The engine checks the formation as an executable condition over open, high, low and close, with a trend filter applied before the count is kept.
Method
The extreme form of the hammer: a negligible body at the top and a lower wick running most of the candle. The distinction is quantitative rather than structural, which is what makes it worth separating and testing.
The traditional claim
Traditionally read as a stronger hammer, on the reasoning that a deeper rejection means a firmer floor.
How this detection is wrong
Every takuri is also a hammer. If the two produce the same forward behaviour, the distinction is decorative — and that is a testable claim.
Published so the count can be reproduced. Every figure below is a parameter of the rule, not a preference: change one and the occurrence count changes with it.
| Parameter | Meaning | Default |
|---|---|---|
| maxBodyPct | body, at most, as a share of the range | 0.1 |
| minLowerPct | lower wick, at least, as a share of the range | 0.75 |
| maxUpperPct | upper wick, at most, as a share of the range | 0.1 |
| trendPeriod | bars of prior trend inspected | 5 |
| maxPriorSlope | prior slope must be below | -1 |
These share enough geometry that a detector can return more than one of them on the same bar. The engine reports every match rather than picking a winner.
Every pair on the site that can be mistaken for another, and what separates each: the look-alikes index.
The extreme form of the hammer: a negligible body at the top and a lower wick running most of the candle. The distinction is quantitative rather than structural, which is what makes it worth separating and testing. The detector also requires a prior downtrend, so the same shape in the wrong context is not counted.
It is read as bullish. Traditionally read as a stronger hammer, on the reasoning that a deeper rejection means a firmer floor.
Every takuri is also a hammer. If the two produce the same forward behaviour, the distinction is decorative — and that is a testable claim.
As an executable rule over open, high, low and close, with 5 named parameters — including body, at most, as a share of the range 0.1, lower wick, at least, as a share of the range 0.75, upper wick, at most, as a share of the range 0.1 — all published on this page so the count can be reproduced. Strict and loose variants are defined as well, so the sensitivity of the count to those thresholds is visible rather than assumed.
Measurement pending re-run
No hit rate is published here yet. The run that would supply one was computed on engine ca6d9e36c81c; the engine is now cfb08765de7c. Its candlestick rows included the still-forming bar, and it predates the chart formations entirely, so those figures have been withdrawn rather than published with a caveat. The definition above is unaffected: it is what the detector tests, and no re-run changes it.