BollingerBandWidth Code

MajorBasse · 2020-02-11T16:29:11+00:00

Is it possible to define what standard deviation the BollingerBandWidth should be based upon in ProBackTest? The code in ProBackTest is “BollingerBandWidth[x](close)” where X is the amount of periods used to calculate the bandwidth. But I would also like to define the standard deviation the bandwidth is calculated with, is this possible? For example: “BollingerBandWidth[20, 3](close) where 3 is the deviation.

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02/11/2020 at 5:29 PM #119328 quote

MajorBasse
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Is it possible to define what standard deviation the BollingerBandWidth should be based upon in ProBackTest?

The code in ProBackTest is “BollingerBandWidth[x](close)” where X is the amount of periods used to calculate the bandwidth.

But I would also like to define the standard deviation the bandwidth is calculated with, is this possible?

For example: “BollingerBandWidth[20, 3](close) where 3 is the deviation.

02/11/2020 at 6:21 PM #119331 quote
Vonasi
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Master
There you go:
```
p = 20
m = 3

bbmid = average[p](close)

bbupper = bbmid + (std[p](close)*m)
bblower = bbmid - (std[p](close)*m)

bbwidth = bbupper - bblower

return bbwidth
```
02/11/2020 at 6:36 PM #119333 quote
Vonasi
Moderator

Master
Something to consider is calculating the bollinger band width as a percentage of the mid line value.
```
p = 20
m = 2

bbmid = average[p](close)

bbupper = bbmid + (std[p](close)*m)
bblower = bbmid - (std[p](close)*m)

bbwidth = bbupper - bblower

bbwidthperc = (bbwidth/bbmid)*100

return bbwidthperc
```
02/11/2020 at 7:54 PM #119345 quote

MajorBasse
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Thank you very much for the quick help Vonasi!
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