BollingerPercentB2

[TedLincoln]

I downloaded the BollingerPercentB2 indicator from this Forum and inserted it into a NinjaScript strategy. However, the strategy doesn't "know" the indicator. The trades are executed in a manner completely unrelated to the logic. Can I correctly use a downloaded indicator within a NinjaScript strategy?

[NinjaTrader_Bertrand]

Hi TedLincoln, welcome to the NinjaTrader support forums! Can you please post the code you used so we can take a look? Thank you!

[TedLincoln]

THIS IS THE STRATEGY I USED. BECAUSE THE "LOW PCT" ON THIS INDICATOR IS A NEGATIVE NUMBER, I USED VARIOUS COMPARATORS; ALL TO NO AVAIL.

For the indicator code, please look at the code for indicator "BollingerPercentB2" Take note of the command "CalculateOnBarClose = false." This looks suspect.
[
// This namespace holds all strategies and is required. Do not change it.
namespace NinjaTrader.Strategy
{
/// <summary>
/// Fade Bollinger high and low line.
/// </summary>
[Description("Fade Bollinger high and low line.")]
public class BollingerFade : Strategy
{
#region Variables
// Wizard generated variables
private int highLine = 60; // Default setting for HighLine
private int lowLine = 60; // Default setting for LowLine
// User defined variables (add any user defined variables below)
#endregion

/// <summary>
/// This method is used to configure the strategy and is called once before any strategy method is called.
/// </summary>
protected override void Initialize()
{
Add(BollingerPercentB2(20, 2));

CalculateOnBarClose = true;
}

/// <summary>
/// Called on each bar update event (incoming tick)
/// </summary>
protected override void OnBarUpdate()
{
// Condition set 1
if (BollingerPercentB2(20, 2).PctB_High[0] >= HighLine)
{
EnterShort(DefaultQuantity, "");
}

// Condition set 2
if (BollingerPercentB2(20, 2).PctB_Low[0] >= LowLine)
{
EnterLong(DefaultQuantity, "");
}
}

#region Properties
[Description("High Bollinger Band")]
[Category("Parameters")]
public int HighLine
{
get { return highLine; }
set { highLine = Math.Max(1, value); }
}

[Description("Low Bollinger Band")]
[Category("Parameters")]
public int LowLine
{
get { return lowLine; }
set { lowLine = Math.Max(1, value); }
}
#endregion
}
}

[NinjaTrader_Bertrand]

Hi Ted, since you use CalculateOnBarClose = false in your strategy, please open up the BollingerPercentB2 indicator script and delete any CalculateOnBarClose setting you see there, then hit F5 to compile all again. The retest this strategy on live data. Thanks!

[TedLincoln]

I want this strategy to work in a simple fashion: when the PCTB_High => 50 go short, when the PCTB_Low =< -50 go long. I can't get this to work properly. Can you put this together correctly, and ship it to me? Otherwise, am I limited to only using the indicator notwithstanding any strategy? If this is the case, I would be greatly disappointed.

[NinjaTrader_Bertrand]

Hi Ted, have you tried setting this basic strategy up in our Strategy Wizard?

It does not require programming and allows you to configure your strategies with a point & click approach - http://www.ninjatrader-support.com/H...rdScreens.html

Later you can view your strategy code to make a smoother transition to programming more advanced concepts in the NinjaScript editor.

[TedLincoln]

Your response: "have you tried setting this basic strategy up in our Strategy Wizard?" Of course!! Try setting up this simple strategy, and send me the code. Otherwise, I must assume that there is no viable response from your end.

[NinjaTrader_JoshP]

Ted,

If it doesn't go into the Strategy Wizard then it is likely the indicator you downloaded was never programmed in a manner to allow for this. You need to contact the original author of the indicator for support on how to use it programmatically.

We currently do not offer custom programming services. If this is something you want you may want to consider one of the 3rd party NinjaScript Consultants here: http://www.ninjatrader.com/webnew/pa...injaScript.htm

[sefstrat]

Just make these changes and it should do what you want.

private int highLine = 50;
private int lowLine = -50;

protected override void OnBarUpdate()
{
// Condition set 1
if (BollingerPercentB2(20, 2).PctB_High[0] >= HighLine)
{
EnterShort(DefaultQuantity, "");
}

// Condition set 2
if (BollingerPercentB2(20, 2).PctB_Low[0] <= LowLine)
{
EnterLong(DefaultQuantity, "");
}
}