Directional Trend Index (DTI)

[eSignal]

File Name: DTI.efs

Description:
Directional Trend Index (DTI)

Formula Parameters:
r: 14
s: 10
u: 5
OB: 25
OS: -25


Notes:
This technique was described by William Blau in his book "Momentum,
Direction and Divergence" (1995). His book focuses on three key aspects
of trading: momentum, direction and divergence. Blau, who was an electrical
engineer before becoming a trader, thoroughly examines the relationship between
price and momentum in step-by-step examples. From this grounding, he then looks
at the deficiencies in other oscillators and introduces some innovative techniques,
including a fresh twist on Stochastics. On directional issues, he analyzes the
intricacies of ADX and offers a unique approach to help define trending and
non-trending periods.
Directional Trend Index is an indicator similar to DM+ developed by Welles Wilder.
The DM+ (a part of Directional Movement System which includes both DM+ and
DM- indicators) indicator helps determine if a security is "trending." William
Blau added to it a zeroline, relative to which the indicator is deemed positive or
negative. A stable uptrend is a period when the DTI value is positive and rising, a
downtrend when it is negative and falling.


Download File:
DTI.efs



EFS Code:

/*********************************
Provided By:  
    eSignal (Copyright c eSignal), a division of Interactive Data 
    Corporation. 2008. 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:        
    Directional Trend Index (DTI)

Version:            1.0  09/26/2008

Formula Parameters:                     Default:
    r                                    14
    s                                    10
    u                                    5
    OB                                   25
    OS                                   -25

Notes:
    This technique was described by William Blau in his book "Momentum,
    Direction and Divergence" (1995). His book focuses on three key aspects 
    of trading: momentum, direction and divergence. Blau, who was an electrical 
    engineer before becoming a trader, thoroughly examines the relationship between 
    price and momentum in step-by-step examples. From this grounding, he then looks 
    at the deficiencies in other oscillators and introduces some innovative techniques, 
    including a fresh twist on Stochastics. On directional issues, he analyzes the 
    intricacies of ADX and offers a unique approach to help define trending and 
    non-trending periods.
    Directional Trend Index is an indicator similar to DM+ developed by Welles Wilder. 
    The DM+ (a part of Directional Movement System which includes both DM+ and 
    DM- indicators) indicator helps determine if a security is "trending." William 
    Blau added to it a zeroline, relative to which the indicator is deemed positive or 
    negative. A stable uptrend is a period when the DTI value is positive and rising, a 
    downtrend when it is negative and falling. 
    

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

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

function preMain() {
    setPriceStudy(false);
    setStudyTitle("Directional Trend Index");
    setCursorLabelName("DTI", 0);
    setCursorLabelName("OB", 1);
    setCursorLabelName("OS", 2);
    setCursorLabelName("ZeroLine", 3);
    setDefaultBarFgColor(Color.brown, 0);
    setDefaultBarFgColor(Color.blue, 1);
    setDefaultBarFgColor(Color.red, 2);
    setDefaultBarFgColor(Color.green, 3);
    
    var x=0;    
    fpArray[x] = new FunctionParameter("r", FunctionParameter.NUMBER);
    with(fpArray[x++]){
        setLowerLimit(1);        
        setDefault(14);
    }

    fpArray[x] = new FunctionParameter("s", FunctionParameter.NUMBER);
    with(fpArray[x++]){
        setLowerLimit(1);        
        setDefault(10);
    }

    fpArray[x] = new FunctionParameter("u", FunctionParameter.NUMBER);
    with(fpArray[x++]){
        setLowerLimit(1);        
        setDefault(5);
    }

    fpArray[x] = new FunctionParameter("OB", FunctionParameter.NUMBER);
    with(fpArray[x++]){
        setDefault(25);
    }

    fpArray[x] = new FunctionParameter("OS", FunctionParameter.NUMBER);
    with(fpArray[x++]){
        setDefault(-25);
    }
}

var xHMU = null;
var xLMD = null;
var xPrice = null;
var xPriceAbs = null;
var xuXA = null;
var xuXAAbs = null;

function main(r, s, u, OB, OS) {

    if ( bInit == false ) { 
        xHMU = efsInternal("Calc_HMU");
        xLMD = efsInternal("Calc_LMD");
        xPrice = efsInternal("Calc_Price", xHMU, xLMD);
        xPriceAbs = efsInternal("Calc_PriceAbs", xPrice);
        xuXA = ema(u, ema(s, ema(r, xPrice)));
        xuXAAbs = ema(u, ema(s, ema(r, xPriceAbs)));
        bInit = true; 
    } 

    if (getCurrentBarCount() < Math.max(Math.max(r, s), u)) return;

    var Val1 = 100 * xuXA.getValue(0);
    var Val2 = xuXAAbs.getValue(0);
    var DTI = 0;
    if (Val2 != 0) DTI = Val1 / Val2;
    else DTI = 0;
    return new Array(DTI, OB, OS, 0);
}

function Calc_PriceAbs(xPrice) {
var nRes = 0;
    nRes = Math.abs(xPrice.getValue(0));
    if (nRes == null) nRes = 1;
    return nRes;
}

function Calc_Price(xHMU, xLMD) {
var nRes = 0;
    nRes = xHMU.getValue(0) - xLMD.getValue(0);
    if (nRes == null) nRes = 1;
    return nRes;
}

function Calc_HMU() {
var nRes = 0;
    if ((high(0) - high(-1)) > 0)
    {
        nRes = high(0) - high(-1);
    }
    else nRes = 0;
    if (nRes == null) nRes = 1;
    return nRes;
}

function Calc_LMD() {
var nRes = 0;
    if ((low(0) - low(-1)) < 0)
    {
        nRes = -(low(0) - low(-1));
    }
    else nRes = 0;
    return nRes;
}