BB RSI Avg Indicator

BB_RSIAverage.efs                                                                EFSLibrary - Discussion Board

File Name: BB_RSIAverage.efs

Description:
BB RSI Avg Indicator

 

Formula Parameters:
MALen : 3
BBLen : 20
NumDevs : 3
RSILen : 14

 

Notes:
This is a powerful technique which combines Bollinger bands, RSI and
Moving averages indicators.

 

Download File:
BB_RSIAverage.efs




EFS Code:

/*********************************
Provided By:  
    eSignal (Copyright c eSignal), a division of Interactive Data 
    Corporation. 2009. All rights reserved. This sample eSignal 
    Formula Script (EFS) is for educational purposes only and may be 
    modified and saved under a new file name.  eSignal is not responsible
    for the functionality once modified.  eSignal reserves the right 
    to modify and overwrite this EFS file with each new release.

Description:        
    BB RSI Avg Indicator
    
Version:            1.0  03/24/2009

Formula Parameters:                     Default:
    MALen                               3
    BBLen                               20
    NumDevs                             3
    RSILen                              14

Notes:
    This is a powerful technique which combines Bollinger bands, RSI and 
    Moving averages indicators. 
**********************************/

var fpArray = new Array();
var bInit = false;

function preMain() {
    setPriceStudy(false);
    setStudyTitle("RSI BB");
    setCursorLabelName("RSI", 0);   
    setCursorLabelName("RSI MA", 1);
    setCursorLabelName("MA MA", 2);
    setCursorLabelName("BB Top", 3);
    setCursorLabelName("BB Bottom", 4);
    setDefaultBarFgColor(Color.green, 0);
    setDefaultBarFgColor(Color.red, 1);
    setDefaultBarFgColor(Color.red, 2);
    setDefaultBarFgColor(Color.blue, 3);
    setDefaultBarFgColor(Color.blue, 4);
    addBand(70, PS_SOLID, 1, Color.black);
    addBand(30, PS_SOLID, 1, Color.black);
    
    var x=0;
    fpArray[x] = new FunctionParameter("MALen", FunctionParameter.NUMBER);
    with(fpArray[x++]) {
        setLowerLimit(1);  
        setDefault(3);
    }
    fpArray[x] = new FunctionParameter("BBLen", FunctionParameter.NUMBER);
    with(fpArray[x++]) {
        setLowerLimit(1);  
        setDefault(20);
    }
    fpArray[x] = new FunctionParameter("NumDevs", FunctionParameter.NUMBER);
    with(fpArray[x++]) {
        setLowerLimit(1);  
        setDefault(3);
    }
    fpArray[x] = new FunctionParameter("RSILen", FunctionParameter.NUMBER);
    with(fpArray[x++]) {
        setLowerLimit(1);  
        setDefault(14);
    }
}

var xRSI = null;
var xRSIMA = null;
var xEMA = null;
var xUpperBB = null;
var xLowerBB = null;

function main(MALen, RSILen, BBLen, NumDevs) {
var nBarState = getBarState();
    if (nBarState == BARSTATE_ALLBARS) {
        if(MALen == null) MALen = 3;
        if(BBLen == null) BBLen = 20;
        if(NumDevs == null) NumDevs = 3;
        if(RSILen == null) RSILen = 14;
	}

	if (bInit == false){
        xRSI     = efsInternal("Calc_UpperBB", MALen, RSILen, BBLen, NumDevs);
        xRSIMA   = getSeries(xRSI,1)
        xEMA     = getSeries(xRSI,2)
        xUpperBB = getSeries(xRSI,3)
        xLowerBB = getSeries(xRSI,4)
        bInit = true;
	}

	if (xEMA.getValue(0) == null) return;

	return new Array(xRSI.getValue(0), xRSIMA.getValue(0), xEMA.getValue(0), xUpperBB.getValue(0), xLowerBB.getValue(0))
}

var yInit = false;
var yRSI = null;
var yRSIMA = null;
var yEMA = null;

function Calc_UpperBB(MALen, RSILen, BBLen, NumDevs) {
var nResH = 0;
var nResL = 0;
var i = 0;
var nTmp = 0;
var StandardDev = 0;
var SumSqr = 0;

    if(yInit == false){
        yRSI   = rsi(RSILen);
        yRSIMA = sma(MALen, yRSI);
        yEMA   = ema(BBLen, yRSIMA);
        yInit  = true
    }

    var nEMA = yEMA.getValue(0);
    if (nEMA == null) return;
	for(i = 0; i < BBLen; i++) {
		nTmp += yRSI.getValue(-i);
		SumSqr += (nTmp / (i + 1) - nEMA) * (nTmp / (i + 1) - nEMA);	
	}
    StandardDev = Math.sqrt(SumSqr / BBLen);		
    nResH = nEMA + NumDevs * StandardDev;
    nResL = nEMA - NumDevs * StandardDev;
    return new Array (yRSI.getValue(0), yRSIMA.getValue(0), yEMA.getValue(0), nResH, nResL);
}