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based on an earlier version of the Wolfram Language.
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SlowStochastic

Is a statistical indicator.
Is computed using the high, low, and close prices.
Returns two time series. The first is the stochastic, which expresses the current price as a percentage of the price range over the last 14 periods smoothed with a 3-period moving average. The second is a 3-period moving average of the stochastic.
FinancialIndicator uses extremes over the last periods and an -period moving average.