Relative strength of instruments against SP500

[Woodbine]

How to make an indicator of SMA of an instrument against ^SP500? Say, SMA(Close of AAPL/Close of ^SP500, Period)? Thanks!

[NinjaTrader_ChelseaB]

Hello Woodbine,

You would need to add additional series to your script, and use the data series with the proper BarsInProgress index.

http://ninjatrader.com/support/helpGuides/nt8/en-us/adddataseries.htm

http://ninjatrader.com/support/helpGuides/nt8/en-us/barsinprogress.htm

http://ninjatrader.com/support/helpGuides/nt8/en-us/seriest.htm

For example

In State.Configure:
AddDataSeries("^SP500", BarsPeriodType.Minute, 1);

This adds the ^SP500 series.

In the scope of the class
private Series<double> myDoubleSeries;

In State.SetDefaults
myDoubleSeries = new Series<double>(this);

This adds a series to hold the quotient of the added series current bar value by the primary series current bar value

In OnBarUpdate:
if (BarsInProgress == 0)
{
myDoubleSeries[0] = Closes[0][0] / Closes[1][0];

Print(SMA(myDoubleSeries, 5)[0]);
}

This would save the quotient to the current bars value for myDoubleSeries and then would print the value of the SMA using this series as the input.

You could also plot this instead of printing this.

http://ninjatrader.com/support/helpGuides/nt8/en-us/addplot.htm

http://ninjatrader.com/support/helpGuides/nt8/en-us/value.htm