Stochastic %D line is the smoothed average of the %K line.
Under the Hood
%D is a 3-period SMA of the %K line, acting as the signal line for the Stochastic Oscillator.
In Practice
When %K crosses above %D from below oversold level, it is a buy signal. When %K crosses below %D from above overbought level, it is a sell signal.
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