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I think this is pretty close.
// LISTING 1
// plot candlestick price chart
Plot( Close, "Price", colorBlack, styleCandle );
GraphXSpace = 1;
// define TAM chart period
//period = 25;
// users of AB Version 4.30 can use Param
period = Param( "TAM period", 25, 2, 100, 1 );
halfperiod = floor( period /2 );
// minor term average
Arm = MA( Close, period );
Plot( Arm, "Minor term avg", colorRed );
// calculate volatility
yom = 100 * ( C - Ref( Arm, halfperiod ))/Ref( Arm, halfperiod );
avyom = MA( yom, 2 * period );
varyom = MA( yom * yom, 2 * period ) - avyom * avyom;
som = Ref( sqrt( varyom ), -halfperiod );
sigom = MA( som, period );
// plot reference price grid
Plot( Arm * ( 1 + 0.01 * sigom ), "Ch+1", colorLightGrey );
Plot( Arm * ( 1 - 0.01 * sigom ), "Ch-1", colorLightGrey );
Plot( Arm * ( 1 + 0.02 * sigom ), "Ch+2", colorLightGrey );
Plot( Arm * ( 1 - 0.02 * sigom ), "Ch-2", colorLightGrey );
Plot( Arm * ( 1 + 0.03 * sigom ), "Ch+3", colorLightGrey );
Plot( Arm * ( 1 - 0.03 * sigom ), "Ch-3", colorLightGrey );
--- In amibroker@xxxxxxxxxxxxxxx, "ed nl" <ed2000nl@xxxx> wrote:
> hello,
>
> does anyone know the algorithm they use to create they channels
(see stockcharts on the site below)
>
> http://contrarians.blogspot.com/2005_01_12_contrarians_archive.html
>
>
> rgds, Ed
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