2012 June: Trading High Yield Bonds Using ETFs by Brooke Gardner – EFS

PriceMA.efs
File Name: PriceMA.efs
Description:
Trading High Yield Bonds Using ETFs by Brooke Gardner.
Formula Parameters:

PriceMA.efs
Price Source: Close
MA Period: 8
MA Type: Simple
Notes:
The related article is copyrighted material. If you are not a subscriber of Stocks & Commodities, please visit www.traders.com.
Download File:
PriceMA.efs

PriceMA.efs

EFS Code:

PriceMA.efs
/*********************************
Provided By:  
    Interactive Data Corporation (Copyright © 2012) 
    All rights reserved. This sample eSignal Formula Script (EFS)
    is for educational purposes only. Interactive Data Corporation
    reserves the right to modify and overwrite this EFS file with 
    each new release. 
	
Description:        
    Trading High Yield Bonds Using ETFs by Brooke Gardner.
 
Version:            1.0  5/04/2012

Formula Parameters:                     Default:
    Price Source                        Close
    MA Period                           8
    MA Type                             Simple   
    
Notes:
    The related article is copyrighted material. If you are not
    a subscriber of Stocks & Commodities, please visit www.traders.com.

**********************************/

var fpArray = new Array();

function preMain()
{
    setPriceStudy(true);
    setCursorLabelName("MA", 0);
    
    var x=0;
    
    fpArray[x] = new FunctionParameter("priceSource", FunctionParameter.STRING);
    with(fpArray[x++])
    {
	setName("Price Source");
        addOption("Open");
        addOption("Close");
        addOption("Low");
        addOption("High");
        addOption("HL/2");
        addOption("HLC/3");
        addOption("OHLC/4");
        setDefault("Close");
    }
    
    fpArray[x] = new FunctionParameter("maPeriod", FunctionParameter.NUMBER);
    with(fpArray[x++])
    {
	setName("MA Period");
	setLowerLimit(1);
        setDefault(8);
    } 
    
 
    fpArray[x] = new FunctionParameter("maType", FunctionParameter.STRING);
    with(fpArray[x++])
    {
	setName("MA Type");
        addOption("Simple");
        addOption("Exponential");
        addOption("Weighted");
        addOption("Volume Weighted");
        setDefault("Simple");
    }   
}

var bInit = false;
var bVersion = null; 

var xSource = null;
var xMA = null;

var i = 0;

function main(priceSource, maPeriod, maType)
{   
    if (bVersion == null) bVersion = verify();
    if (bVersion == false) return;    
    
    // Back Testing formulas are not for real time analysis.
    // Therefore, prevent processing and exit at bar 0.
    if (getCurrentBarIndex() == 0) return;    
    
    if (!bInit)
    {
        switch (priceSource)
        {
                case 'Open': 
                   xSource = open();
                   break;
                case 'Close':
                   xSource = close();
                   break;
                case 'High':
                   xSource = high();
                   break;
                case 'Low':
                   xSource = low();
                   break;
                case 'HL/2':
                   xSource = hl2();
                   break;
                case 'HLC/3':
                   xSource = hlc3();
                   break;
                case 'OHLC/4':
                   xSource = ohlc4();
                   break;
                default : xSource = close();
        }
        
        switch (maType)
        {
            case "Simple" :
                xMA = sma(maPeriod, xSource);
                break;
            case "Exponential" : 
                xMA = ema(maPeriod, xSource);
                break;
            case "Weighted" :
                xMA = wma(maPeriod, xSource);
                break;
            case "Volume Weighted" :
                xMA = vwma(maPeriod, xSource);
                break;
            default : xMA = sma(maPeriod, xSource);
        }
        
        bInit = true;
    }   

    var nPrice = xSource.getValue(0);
    var vMA = xMA.getValue(0);
    
    // Exit Strategy
    if (Strategy.isInTrade())
    {
        if (Strategy.isLong() && nPrice < vMA)
        {
            Strategy.doSell("Long Exit Signal", Strategy.CLOSE, Strategy.THISBAR);
        }
        else if (Strategy.isShort() && nPrice > vMA)
        {
            Strategy.doCover("Short Exit Signal", Strategy.CLOSE, Strategy.THISBAR);
        }
    }
    
    // Entry Strategy
    if (!Strategy.isInTrade())
    {
        if (nPrice > vMA)
        {
            Strategy.doLong("Long signal", Strategy.CLOSE, Strategy.THISBAR);
            drawShape(Shape.UPARROW, AboveBar1, Color.lime, i++);
        }
        else if (nPrice < vMA)
        {
            Strategy.doShort("Short signal", Strategy.CLOSE, Strategy.THISBAR);
            drawShape(Shape.DOWNARROW, BelowBar1, Color.red, i++);
        }
    }
    
    return xMA.getValue(0);
}

// verify version
function verify() {
    var b = false;
    if (getBuildNumber() < 779) {
        drawTextAbsolute(5, 35, "This study requires version 8.0 or later.", 
            Color.white, Color.blue, Text.RELATIVETOBOTTOM|Text.RELATIVETOLEFT|Text.BOLD|Text.LEFT,
            null, 13, "error");
        drawTextAbsolute(5, 20, "Click HERE to upgrade.@URL=http://www.esignal.com/download/default.asp", 
            Color.white, Color.blue, Text.RELATIVETOBOTTOM|Text.RELATIVETOLEFT|Text.BOLD|Text.LEFT,
            null, 13, "upgrade");
        return b;
    } else {
        b = true;
    }
    return b;
}