This video demonstrates how to set up Tutorial 173 (Markplex SuperTrend) in TradeStation RadarScreen. This involves making sure that "load additional data for accumulative calculations" is selected and an appropriate number of bars is entered. "Load additional data" is required for calculations that use the value of the calculation the previous bar to give the value for the current bar.
Tutorial 173 uses the exponential moving average as part of its calculation. If you open the XAverage function, you will see the calculation is:

XAverage = XAverage[1] + SmoothingFactor * ( Price - XAverage[1] );

In other words, the exponential moving average for the current bar is equal to the exponential moving average for the previous bar plus the difference between the price of the current bar and the exponential moving average of the previous bar, multiplied by a smoothing factor.

TradeStation recommend that the number of additional bars is equal to 4.5 multiplied by the Length input. In this video I estimated this to be 50.

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