Market Facilitation Index (MFI)

/*********************************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:            Market Facilitation Index (MFI)Version:            2.0  05/27/2009 Formula Parameters:                     Default:    Source of Volume                    Volume    Color Histogram                     Green    Display Title Value                 True    Notes:    The Market Facilitation Index is an indicator that relates price range to     volume and measures the efficency of price movement. Use the indicator to     determine if the market is trending. If the Market Facilitation Index increased,     then the market is facilitating trade and is more efficient, implying that the     market is trending. If the Market Facilitation Index decreased, then the market     is becoming less efficient, which may indicate a trading range is developing that     may be a trend reversal.**********************************/var fpArray = new Array();var bInit = false;var bBail = false; function preMain() {    setPriceStudy(false);    setShowCursorLabel(true);    setShowTitleParameters(false);    setStudyTitle("Market Facilitation Index ");    setCursorLabelName("MFI", 0);    setDefaultBarFgColor(Color.red, 0);    setPlotType(PLOTTYPE_HISTOGRAM, 0);     setDefaultBarThickness(1, 0);    askForInput();    var x=0;    fpArray[x] = new FunctionParameter("LineColor", FunctionParameter.COLOR);    with(fpArray[x++]){        setName("Color Histogram");        setDefault(Color.green);    }        fpArray[x] = new FunctionParameter("ViewValue", FunctionParameter.BOOLEAN);    with(fpArray[x++]){       setName("Display Title Value");       setDefault(true);    }        fpArray[x] = new FunctionParameter("sMyVol", FunctionParameter.STRING);    with(fpArray[x++]){       setName("Source of Volume");       setDefault("volume");    }        }var xMFI = null;function main(sMyVol, LineColor, ViewValue) {var nBarState = getBarState();var nMFI;     if (nBarState == BARSTATE_ALLBARS)  {        sMyVol = "volume";        LineColor = Color.green;        ViewValue = true;    }    if ( bBail == true ) {         return;     }         if ( bInit == false ) {         if (isRawTick() == true) {             setStudyTitle("Sorry. This script does not run in tick charts.")            bBail = true;             return;         } else {            setStudyTitle("Market Facilitation Index");        }        setDefaultBarFgColor(LineColor, 0);        setShowCursorLabel(ViewValue);        xMFI = efsInternal("Calc_MFI", sMyVol);        bInit = true;     }     nMFI = xMFI.getValue(0);    if (nMFI == null) return;    return nMFI;}var bSecondInit = false;var xmyVol = null;var xmyhigh = null;var xmylow = null;function Calc_MFI(sMyVol) {var nRes = 0;var nmyhigh = 0;var nmylow = 0;    if (bSecondInit == false) {        xmyVol = eval(sMyVol)();               xmyhigh = high();        xmylow = low();        bSecondInit = true;    }    nRes   = xmyVol.getValue(0);    nmyhigh = xmyhigh.getValue(0);    nmylow  = xmylow.getValue(0);    if (nmyhigh == null) return;    nRes = (nmyhigh - nmylow) / nRes * 10000;    return nRes;     }