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X_STUDY® Documentation

Stochastic Fast (StochF)


The Stochastic Fast (StochF) normalizes price as a percentage between 0 and 100. Normally two lines are plotted, the %K line and a moving average of the %K which is called %D. A fast stochastic is created by not smoothing the %K line with a moving average before it is displayed.


Fast %K = 100 SMA ( ( ( Close - Low ) / ( High - Low ) ),Time Period )

Fast %D = SMA ( Fast %K )


  • Close = the current closing price
  • Low = the lowest low in the past n periods
  • High = the highest high in the past n periods