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  • Negative Volume Index

    File Name: NVI_Peterson.efs

    Description:
    Negative 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:
    NVI_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:        
        Negative 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("Negative Volume Index");
        
    setCursorLabelName("NVI",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 
    xNVI null;
    var 
    xNVI_EMA null;

    function 
    main(EMA_Len) {
    var 
    nBarState getBarState();
    var 
    nNVI 0;
    var 
    nEMA 0;
        if (
    nBarState == BARSTATE_ALLBARS) {
            if(
    EMA_Len == nullEMA_Len 255;
        }
        if (
    bInit == false) {
            
    xNVI efsInternal("Calc_NVI");
            
    xNVI_EMA ema(EMA_LenxNVI);
            
    bInit true;
        }
        
    nNVI xNVI.getValue(0);
        
    nEMA xNVI_EMA.getValue(0);
        if (
    nEMA == null) return;
        return new Array(
    nNVInEMA);
    }

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

    function 
    Calc_NVI() {
    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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