Calling indicator on Range bars from a Strategy running on Unirenko Bars

[bobperez]

Hello.

I have a strategy that runs on Unirenko bars, I need to use the Momentum(EMA(ES-023,( x Range) EmaPeriod), MomentumPeriod) as a filter to enter/not enter orders. Both, the Momentum and EMA have to be calculated on Range Bars, and its value used by the strategy on the Unirenko chart.

How can I do that from the strategy?



Thanks,

BobPerez

[NinjaTrader_ChrisL]

Hello, thanks for writing in. The scripting library supports multi time frame scripts. The indicators can be set up to reference the secondary data series. We have a full guide on multi time frame scripts linked below. You should read the entire thing, but the important part about referencing indicator data is in the section "Using Bars Objects as Input to Indicator Methods"

https://ninjatrader.com/support/helpGuides/nt8/NT%20HelpGuide%20English.html?multi-time_frame__instruments.htm

Kind regards,
-ChrisL

[bobperez]

Thank you Chris, I'll study the library.

[bobperez]

Hi Chris, today is Dec 24th, so I don't expect an answer right away.

I. MomentumSeries2
I read all the help guides regarding my issue. I still don't know how to write the following command, so the momentum is calculated on the 2nd series also:

EMA2 = EMA(BarsArray[1], 10)
Mom2 = Momentum( EMA2, 3)

I understand Momentum is taking its input from the EMA2 which is calculated on the 2nd series, but the momentum calculation is done on the primary series.

I modified the SampleSecondarySeriesAsInputSeries developed by a Ninjatrader Support Member, to use it as a momentum indicator that makes calculations over the secondary series for both the EMA and Momentum indicators.

Here it is: MomentumSeries2.zip



a. The chart on the left is a 4-Range chart. The chart on the right Is a Unirenko(T2O1R8) -Red/Green bars- chart with a 4Range second series - Black/white bars - chart added to it.

b. I manually set up the yellow indicator on the Range chart. Momentum(EmaSecondarySeries, 2). Then I added the MomentumSeries2 (blue) indicator on top and the values match exactly.

b. On the right chart, I added the MomentumSeries 2 to both the Unirenko and Range series on the chart.

c. Please notice that the values on the range series (blue) match exactly the values on the left chart. The values on the Unirenko (Cyan) do not match the Range values in the same time slot.

My strategy requires the values from the Range series, not those from the Unirenko series.

I hope I made my point clear.

II. Another doubt:

The help guide states:

Arguments supplied to AddDataSeries() should be hardcoded and NOT dependent on run-time variables which cannot be reliably obtained during State.Configure (e.g., Instrument, Bars, or user input). Attempting to add a data series dynamically is NOT guaranteed and therefore should be avoided. Trying to load bars dynamically may result in an error similar to: Unable to load bars series. Your NinjaScript may be trying to dynamically use an additional data series in an unsupported manner.

Does this mean that I cannot pass arguments such as the Range Period to the AddDataSeries?

if (State == State.Configure)
      {​
                AddDataSeries("",Data.BarsPeriodType.Range, RangePeriod, Data.MarketDataType.Last);
​      }

Happy Holiday
Bob