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It's percent of standard deviation so 200 would be equivalent to 2
standard deviations
--- In amibroker@xxxxxxxxxxxxxxx, "Owen Davies" <owen5819@xxxx> wrote:
> The following relates to version 4.36.0, but no doubt is relevant
to earlier
> editions as well.
>
> I don't ordinarily have Bollinger bands on the chart, and so had
not looked
> at the settings on the Preferences page in a long time. It came as
a
> surprise to see that the width setting for BBands is calibrated in
percent,
> rather than multiples of the standard deviation. This is not
explained in
> the documentation, even online, so far as I could find. Best
guess: The
> percentage is the fraction of values that will be found between the
upper
> and lower band; thus a setting of 95 would equal 1.96 in a
conventional
> setting--close enough for government work, though I'm not enough of
a
> statistician to figure out the equivalent of 1.8, which is what I
really
> wanted.
>
> The one flaw in this interpretation appears when the Amibroker
chart is
> compared with a Metastock chart of the same data. On AB, the S&P
spends a
> lot more time outside the upper and lower bands than it does with
MS, given
> identical moving averages and settings of 95 in AB and 2 standard
deviations
> in MS.
>
> In short, I'm confused. Can anyone clear this up for me?
>
> Many thanks.
>
> Owen Davies
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