MACD + Signal Formel

[Alen]

hallo,
which formel does eSignal use to calculate MACD, and the MACD Signal line?
thanks,
alen

[ACM]

alen
The Basic Studies version of the MACD can use either simple or exponential averages whereas the EFS2 version only uses exponential
Alex

[Alen]

Alexis
I know that, but there are two different ways to calculate the k factor

the one is 2/(days +1) and the other ... I just forgot
so I would like to know which formula esignal exactly use.

thanks,
alen

[ACM]

alen
The formula for the exponential averages used to calculate the MACD and Signal lines is the same as the ema.efs that you can find in the Library folder of Formulas. In that formula the length which is expressed in periods is converted to a percentage value in line 29 using the equation dPercent = (2.0 / (nInputLength + 1.0));
Alex

[ACM]

alen
As a note of interest here is a complete MACD formula written in efs2 using a slightly revised version of the ema.efs that is in the Library folder to compute all the exponential averages.
In the image that follows you can see the plot returned by the script compared to that of the Basic Studies MACD set to use only exponential averages
Alex

var MACD = null
var SIG = null;

function main(){
    if(MACD==null) MACD = efsInternal("calcMACD",12,26,close());//creates a series of the MACD
    if(SIG==null) SIG = efsInternal("calcEMA",9,MACD);//uses MACD series as input to calcEMA function
    if(MACD.getValue(0)==null||SIG.getValue(0)==null) return;
    return new Array (MACD.getValue(0),SIG.getValue(0));
}

var xAvg1 = null;
var xAvg2 = null;
//this section calculates the MACD (ie the difference between the exponential averages)
function calcMACD(Length1,Length2,Source) {
    if(xAvg1 == null) xAvg1 = efsInternal("calcEMA",Length1,Source);
    if(xAvg2 == null) xAvg2 = efsInternal("calcEMA",Length2,Source);
    if(xAvg1.getValue(0)==null||xAvg2.getValue(0)==null) return;
    var xMACD = xAvg1.getValue(0)-xAvg2.getValue(0)
    return xMACD;
}
//this section calculates the exponential moving averages used by the MACD
//and Signal lines
var dThisMA = null;
var dLastMA = null;
var dPercent = 0.0;
var bPrimed = false;

function calcEMA(nInputlength,source) {
    var nBarState = getBarState();
    var dSum = 0.0;
    if(nBarState == BARSTATE_ALLBARS) {
        dPercent = (2.0/(nInputlength+1.0));
        bPrimed = false;
    }
    if(nBarState == BARSTATE_NEWBAR) {
        dLastMA = dThisMA;
    }
    if(bPrimed == false) {
        for(var i=0; i<nInputlength; i++) {
            if(getCurrentBarCount()<nInputlength) return;
            dSum += source.getValue(-i);
        }
        bPrimed = true;
        dThisMA = dSum/nInputlength;
        
    } else {
        dThisMA = ((source.getValue(0)-dLastMA)*dPercent)+dLastMA;
    }
    return dThisMA;
}