_SECTION_BEGIN("Trend Intensity Index");

SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} – {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot( Close, "Price", colorWhite, styleCandle );
n = Param("Periods",10,5,100,5);
//Calculate Simple Moving Average (SMA) of the closing prices
SMA=MA(Close,n);
//Calculate Positive and Negative deviation of the closing prices from SMA calculated in step 1
Dev = Close - SMA;
posDev = IIf( Dev>0, Dev, 0 ); 
negDev = IIf( Dev<0, abs(Dev), 0 ); 
//Calculate sum of Positive and Negative deviations for the period twice smaller than period used for SMA calculation. 
if ( n%2 == 0)
    m = n/2;
else 
	m = (n+1)/2;
SDpos = sum(posDev, m);
SDneg = sum(negDev, m);
//Calculate Trend Intensity index
TII = 100 * (SDpos) / (SDpos + SDneg);
//Calculate second line (Signal line) as EMA applied to TII
TIISignal = EMA(TII, 9);
Plot( TII , "TII", colorWhite, styleLine | styleOwnScale ); 
Plot ( TIISignal ,"TII Signal", colorBlue, styleLine | styleOwnScale ); 

_SECTION_END();