Ladder Bottom (CDLLADDERBOTTOM)

Summary

Five-candle bullish reversal pattern: three consecutively lower black candles, a fourth black candle with a non-very-short upper shadow, then a white candle that opens above the prior open and closes above the prior high. A hit is a bullish reversal signal, most meaningful after a downtrend.

Notes

Does not verify the preceding downtrend that this bullish reversal classically assumes.
Bulkowski's testing found this reverses a downtrend only 56% of the time — "near random" — and it is extremely rare (451 occurrences out of 4.7 million candle lines), ranking 41st of 103 patterns for overall performance. (thepatternsite.com)

Inputs

inOpen — Open price of each bar
inHigh — High price of each bar
inLow — Low price of each bar
inClose — Close price of each bar

Outputs

outInteger — +100 on a detected ladder bottom, 0 otherwise. Only ever emits +100 (never -100); inherently bullish

Output Values

Value	Meaning
0	No pattern
100	Ladder Bottom detected — a bullish reversal signal, most meaningful after a downtrend (unverified by the function)

Properties

Numerical Stability: Start-Independent


☐ Overlap Input
✅ Independent Y-Axis i
✅ Candlestick i
☐ Can Output NaN or ±Inf
☐ Identity at Period 1

Implementation

TA-Lib Definition: cdlladderbottom.c · cdlladderbottom.yaml

Native	File
C	`ta_CDLLADDERBOTTOM.c`
Rust	`cdlladderbottom.rs`
Java	`Core_CDLLADDERBOTTOM.java`

TA-Lib is also available for Python, R and more using a wrapper.

Aliases

Ladder Bottom