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  • Positive Volume Index

    File Name: PVI_Peterson.efs

    Description:
    Positive Volume Index

    Formula Parameters:
    EMA_Len : 255

    Notes:
    The theory behind the indexes is as follows: On days of increasing volume,
    you can expect prices to increase, and on days of decreasing volume, you can
    expect prices to decrease. This goes with the idea of the market being in-gear
    and out-of-gear. Both PVI and NVI work in similar fashions: Both are a running
    cumulative of values, which means you either keep adding or subtracting price
    rate of change each day to the previous day`s sum. In the case of PVI, if today`s
    volume is less than yesterday`s, don`t add anything; if today`s volume is greater,
    then add today`s price rate of change. For NVI, add today`s price rate of change
    only if today`s volume is less than yesterday`s.


    Download File:
    PVI_Peterson.efs



    EFS Code:
    PHP 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:        
        Positive Volume Index
        
    Version:            2.0  05/28/2009
     
    Formula Parameters:                     Default:
        EMA_Len                             255
        
    Notes:
        The theory behind the indexes is as follows: On days of increasing volume, 
        you can expect prices to increase, and on days of decreasing volume, you can 
        expect prices to decrease. This goes with the idea of the market being in-gear 
        and out-of-gear. Both PVI and NVI work in similar fashions: Both are a running 
        cumulative of values, which means you either keep adding or subtracting price 
        rate of change each day to the previous day`s sum. In the case of PVI, if today`s 
        volume is less than yesterday`s, don`t add anything; if today`s volume is greater, 
        then add today`s price rate of change. For NVI, add today`s price rate of change 
        only if today`s volume is less than yesterday`s.
    **********************************/
    var fpArray = new Array();
    var 
    bInit false;

    function 
    preMain(){
        
    setStudyTitle("Positive Volume Index");
        
    setCursorLabelName("PVI",0);
        
    setDefaultBarFgColor(Color.red,0);
        
    setCursorLabelName("EMA",1);
        
    setDefaultBarFgColor(Color.blue,1);
        var 
    0;
        
    fpArray[x] = new FunctionParameter("EMA_Len"FunctionParameter.NUMBER);
        
    with(fpArray[x++]) {
            
    setLowerLimit(1);
            
    setDefault(255);
        }    
    }

    var 
    xPVI null;
    var 
    xPVI_EMA null;

    function 
    main(EMA_Len) {
    var 
    nBarState getBarState();
    var 
    nPVI 0;
    var 
    nEMA 0;
        if (
    nBarState == BARSTATE_ALLBARS) {
            if(
    EMA_Len == nullEMA_Len 255;
        }
        if (
    bInit == false) {
            
    xPVI efsInternal("Calc_PVI");
            
    xPVI_EMA ema(EMA_LenxPVI);
            
    bInit true;
        }
        
    nPVI xPVI.getValue(0);
        
    nEMA xPVI_EMA.getValue(0);
        if (
    nEMA == null) return;
        return new Array(
    nPVInEMA);
    }

    var 
    bSecondInit false;
    var 
    xROC null;
    var 
    xVolume null;

    function 
    Calc_PVI() {
    var 
    nRes 0;
    var 
    nRef ref(-1);
        if (
    bSecondInit == false) {
            
    xROC roc(1);
            
    xVolume volume();
            
    bSecondInit true;
        }
        if (
    xROC.getValue(-1) == null) return;
        if(
    xVolume.getValue(0) > xVolume.getValue(-1)) {
            
    nRes nRef xROC.getValue(0);    
        } else {
            
    nRes nRef;
        }    
        return 
    nRes;

    Regards,
    Jay F.
    Product Manager
    _____________________________________
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