Stochastic Oscillator (Slow D)

Slow Stochastic %D is the moving average of the Slow %K line. It is the smoothest of the stochastic signals and is often used as the primary decision-making line in trading systems.

Traders watch for crossovers between Slow %K and Slow %D. A buy signal occurs when Slow %K crosses above Slow %D from oversold levels, while a sell signal appears when Slow %K crosses below Slow %D from overbought levels. Because both lines are smoothed, these signals are considered more reliable but slightly delayed.

For instance, if a stock’s Slow %K climbs above Slow %D while both are near 18, traders may see it as confirmation that momentum is shifting upward from oversold conditions.

Parameter	Description	Default Value
Window	Number of periods for calculation	14
Smoothing Period	Number of periods for smoothing	3