Displaying TREND-QUALITY INDICATOR Pastie For Amibroker (AFL)

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I found it in the internet. I am not the author. Thanks
 
This Indicator attempts to estimate the trend in relation to noise. 
 
 
LISTING 1
// Piecewise EMA is an EMA that restarts calculations each time
// the 'sincebar' argument is true
function PiecewiseEMA( array, range, sincebar )
{
  factor = IIf( sincebar, 1, 2/(range+1) );
  return AMA2( array, factor, 1-factor );
}
// parameters
m=4;
n=250;
// generate reversal signals based on EMA crossover rule
Lpf1 = EMA( C, 7  );
Lpf2 = EMA( C, 15 );
CrossPoint = Cross( Lpf1, Lpf2 ) OR Cross( Lpf2, Lpf1 );
Periods = BarsSince( CrossPoint );
// variable bar sum
DC = Close - Ref( Close, -1 );
CPC = Sum( DC, Periods );
// smooth CPC by piecewise 4 bar EMA
Trend = PiecewiseEMA( CPC, 4, CrossPoint );
// noise
DT = CPC - Trend;
Noise = 2 * sqrt( MA( DT^2, n ) );
// alternative 'linear' noise calculation
// Noise = 2 * MA( abs( DT ), n ) );
QIndicator = Trend/Noise;
Plot(sign(Lpf1-Lpf2), "Rev", colorRed );
Plot( Qindicator, "Qindicator", colorGreen, styleHistogram);
PlotGrid( -1 );
PlotGrid( 1 );
PlotGrid( 2 );
PlotGrid( -2 );
PlotGrid( 5 );
PlotGrid( 5);

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TREND-QUALITY INDICATOR for Amibroker (AFL)