STOCH

Summary

Slow Stochastic oscillator: locates the close within the high-low range over a lookback period, then double-smooths it. Returns the Slow-%K and Slow-%D lines. SlowK/SlowD > 80 overbought, < 20 oversold; %K crossing %D signals momentum shifts.

Formula

FastK = 100*(Close - LL_n)/(HH_n - LL_n), n = FastK_Period (LL/HH = lowest low / highest high over n) SlowK = MA(FastK, SlowK_Period, SlowK_MAType) SlowD = MA(SlowK, SlowD_Period, SlowD_MAType)

Notes

When the high-low range over the window is zero, the raw stochastic is set to 0 instead of being undefined.

Inputs

inPriceHLC — High/Low/Close series; range from High/Low, level from Close

Outputs

outSlowK — Raw FastK smoothed by SlowK_Period MA
outSlowD — Signal line: SlowK smoothed by SlowD_Period MA

Parameters

optInFastK_Period — Lookback window for the raw %K high-low range
optInSlowK_Period — Smoothing period turning FastK into SlowK
optInSlowK_MAType — MA type used to smooth into SlowK
optInSlowD_Period — Smoothing period for the SlowD signal line
optInSlowD_MAType — MA type used for the SlowD line

Implementation

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

Native	File
C	`ta_STOCH.c`
Rust	`stoch.rs`
Java	`Core.java`

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

Aliases

Stochastic, Stochastic Oscillator, Slow Stochastic