In-Neck Pattern (CDLINNECK)

Summary

A two-candle in-neck pattern: a long black candle followed by a white candle that opens below the prior low and closes just barely into the prior body (near the prior close). It is a bearish continuation signal. A hit signals bearish continuation (the down move is expected to resume).

Formula

Two candles. First: black (close1 < open1) with a long real body (realbody > candleaverage(BodyLong)). Second: white (close2 >= open2), opens below the first candle's low (open2 < low1), and closes slightly into the first body: close2 >= close1 AND close2 <= close1 + candleaverage(Equal). No prior-trend check is performed.

Notes

Does not verify the preceding downtrend that this bearish continuation pattern assumes.
Bulkowski's testing found the bearish continuation holds only 53% of the time — "near random" — though its overall post-breakout performance still ranks a strong 17th of 103. (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 when the in-neck pattern is detected, 0 otherwise. This pattern only ever emits the negative (bearish) signal; it never emits +100

Output Values

Value	Meaning
-100	In-Neck pattern detected: bearish continuation
0	No pattern

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: cdlinneck.c · cdlinneck.yaml

Native	File
C	`ta_CDLINNECK.c`
Rust	`cdlinneck.rs`
Java	`Core_CDLINNECK.java`

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

Aliases

In-Neck Pattern, In-Neck Line