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Hi ,
This is what I use for the triple screen, it allows you to adjust the
envelope to each stock or future.
sp = Param( "pds1 Period", 13, 2, 100 );
r = EMA(C, sp );
Plot( r, "EMA("+WriteVal(sp,1.0)+")", ParamColor("pds1 Color",
colorGreen ) );
s = Param( "pds2", 26, 2, 100 );
m = EMA(C, s );
Plot( m, "EMA("+WriteVal(s,1.0)+")", ParamColor("pds2Color",
colorRed ) );
x= Param( "cond1", .091, .01,1,.001 );
cond1= EMA(C,13)+EMA(C,13)*x;
Cond2= EMA(C,13)-EMA(C,13)*x;
Plot(C, "Price",colorYellow, styleBar );
Plot(cond1,"upper band",ParamColor("",colorBlue),1);
Plot(cond2,"Lower band",ParamColor("",colorBlue),1);
Enjoy,
Dennis
--- In amibroker@xxxxxxxxxxxxxxx, "Dave Merrill" <dmerrill@xxxx>
wrote:
> does anyone know how to automatically calculate channel (envelope)
widths
> like dr. elder intends? far as I can tell, this is idiosyncratic to
him;
> everywhere else I've found references to channels, they just mean
the
> general idea of constant ratio above and below an EMA.
>
> here's what he says in Come Into My Trading Room:
>
> ----------
> Upper channel line = EMA + (EMA * Channel coefficient)
> Lower channel line = EMA - (EMA * Channel coefficient)
>
> A well-drawn channel contains the bulk of prices, with only a few
extremes
> poking out. Adjust the coefficient until the channel contains
approximately
> 95 percent of all prices for the past several months.
Mathematicians call
> the "second standard deviation channel". Most software packages
make this
> adjustment very easy.
> ----------
>
> I don't know how to turn the reference to standard deviation into
code. he
> specifically contrasts channels to Bollinger Bands, which are
plotted some
> number of standard deviations away from the EMA.
>
> anyone understand this better than me?
>
> dave
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