[amibroker] Standard error channel

["sahamnyangkut" <chuankabeh@xxxxxxxxx>]

Hi all,
 
I want to plot standar error channel using AFL. After googling, I found this: http://www.mail-archive.com/amibroker@xxxxxxxxxxxxxxx/msg29588.html
The problem is there is no "width" parameter in that AFL as we can see in Study Drawing Tool.
Any idea how to implement "width"?
 
Here is my AFL based on msg29588 discussion:
 
 
 
TimeFrameSet( inDaily );
SetBarsRequired(100000,0);
periode = Param("Periode",30,30,50000,1);
 
bar = BarIndex();
islastbar = bar == BarCount - 1;
isfirstbar = bar == BarCount - periode;
 
firstbar = LastValue( ValueWhen( isfirstbar, bar ) );
 
lastbar = LastValue( ValueWhen( islastbar, bar ) );
 
al = LastValue( ValueWhen( islastbar, LinRegSlope( C, lastbar - firstbar + 1
) ) );
 
bl = LastValue( ValueWhen( islastbar, LinRegIntercept( C, lastbar - firstbar
+ 1 ) ) );
 
Lr = al * ( BarIndex() - firstbar ) + bl;
 
Lr = IIf( bar >= firstbar AND bar <= lastbar , Lr, Null );
 
se = StdErr(C,lastbar - firstbar);
 
se = LastValue( ValueWhen( islastbar, StdErr( C, lastbar - firstbar + 1 ) )
);
 
upper = Lr + se;
 
Lower = Lr - se;
TimeFrameRestore();
Plot(Lr, "lr", colorYellow, styleThick );
 
Plot(upper, "upper", colorGreen, styleThick );
 
Plot(Lower, "lower", colorRed, styleThick );
 
SetBarFillColor( IIf( C > O, colorBrightGreen, colorRed ) );
 
Plot(C, "C", colorWhite, styleCandle );
 
--
Regards,
 
ChuanKabeh



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