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This might help:
http://mathworld.wolfram.com/StandardDeviationDistribution.html
Pal
--- In amibroker@xxxxxxxxxxxxxxx, "Gary A. Serkhoshian"
<serkhoshian777@xxxx> wrote:
> Mark,
>
> For those of us less statistically inclined, can you please
explain Gaussian population in simple terms. Is it essentially the
bell curve phenomenon?
>
> Thanks,
> Gary
>
> MarkF2 <feierstein@xxxx> wrote:
> --- In amibroker@xxxxxxxxxxxxxxx, "jtelang" <jtelang@xxxx> wrote:
> > Hi Dimitris,
> >
> > A bit confused about couple of things here... Hope you can
clarify.
> >
> > 1. BBands are calculated as standard deviation, so by
definition, 2
> > times BBands is supposed to capture 95% of the values over
periods
> > specified.
>
> No. 95% of the values in a *Gaussian population* lie within 1.96
SDs
> of the *population* mean. First, the population isn't Gaussian.
> Second, we're only dealing with (small) *samples* from the
> population.
>
>
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