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Hello John,
Thanks for that.
Simple but effective.
If you don't mind me saying, I think I prefer %b to BB themselves.
I see you include the equation in your tutorial section.
http://www.bollingerbands.com/services/bb/?page=5
Any tips on how to trade %b?
BB (also known as brian_z)
--- In amibroker@xxxxxxxxxxxxxxx, "bbands" <BBands@xxx> wrote:
>
> --- In amibroker@xxxxxxxxxxxxxxx, "droskill" <droskill@> wrote:
> >
> > Hey all - I'm trying to put together an indicator based on
Standard
> > Deviation. The difference, from, say Bollinger Bands in this
case is
> > that I want to show the Std Dev from a moving average in terms of
1,2
> > and 3 standard deviations from mean, where mean is an N day moving
> > average. So, the mean would be represented by a constant straight
> > line on a chart, and then a line would go up/down around it.
> >
> > For an example, check this out:
> >
> http://www.indexindicators.com/charts/sp500-vs-sp500-50d-rsma-
params-3y-x-x/
> >
> > I really don't know how to approach this - anybody have any
> > thoughts/ideas? Or maybe someone has done it before (or it's in
AB
> > already) and I just haven't found it.
> >
> > Thanks!
>
> I think %b is what you want.
>
> %b = (last - lowerBB) / (upperBB - lowerBB)
>
> (%b is derived from the formula for Stochastics.)
>
> Using the standard BB parameters of +/- 2 sd:
>
> +2, %b = 1.0
> +1, %b = 0.75
> 0, %b = 0.5
> -1, %b = 0.25
> -2, %b = 0.0
>
> If you need centered numbers you can subtract 0.5 from %b and
multiply
> the result by two, or whatever constant suits your ap. Again using
the
> defaults of +/- 2 sd:
>
> %b_norm = (%b - 0.5) * 2.0
>
> Which would give:
>
> +2, %b = 1.0
> +1, %b = 0.5
> 0, %b = 0.0
> -1, %b = -0.5
> -2, %b = -1.0
>
> Or, again sing the default parms od +/1 2 sd, multiplying by 4 would
> give you the intuitive number you seek:
>
> +2, %b = 2.0
> +1, %b = 1.0
> 0, %b = 0.0
> -1, %b = -1.0
> -2, %b = -2.0
>
> Enjoy,
>
> jab
> www.bbands.com
>
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