how to calculate BollingerBandWidth ?

• 11/28/2022 at 5:18 PM #204961
  ZeroCafeine

  Hi everyone,

  someone can tell me how this variable “BollingerBandWidth” is calculated please, because I don’t find the same result with a manual calculation, maybe it’s not the same standard deviations or something is missing, I get A different of D ?

  A = BollingerBandWidth[20](Close) BBUp = BollingerUp[20] BBDown = BollingerDown[20] D = BBUp - BBDown Return A, D

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  A = BollingerBandWidth[20](Close)   BBUp = BollingerUp[20] BBDown = BollingerDown[20]   D = BBUp - BBDown   Return A, D

  Best Reguards

  

  ZeroCafeine

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  11/28/2022 at 5:25 PM #204964
  robertogozzi

  There you go:

  // // Bollinger BB% // DEFPARAM CalculateOnLastBars = 1000 p = 20 dev = 2.0 BollInf = Average[p,0](close) - (dev * std[p](close)) BollSup = Average[p,0](close) + (dev * std[p](close)) pB = ((close - BollInf) / (BollSup - BollInf)) * 100 return pB AS "Boll BB %",80 AS "Ob",20 AS "Os"

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  // // Bollinger BB% // DEFPARAM CalculateOnLastBars = 1000 p       = 20 dev     = 2.0 BollInf = Average[p,0](close) - (dev * std[p](close)) BollSup = Average[p,0](close) + (dev * std[p](close)) pB      = ((close - BollInf) / (BollSup - BollInf)) * 100 return pB AS "Boll BB %",80 AS "Ob",20 AS "Os"

  

  robertogozzi

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  11/29/2022 at 9:13 AM #204988
  Nicolas

  Bollinger B% is not the same as Bollinger BandWidth, as per our documentation: https://www.prorealcode.com/documentation/bollingerbandwidth/

  Calculation :

  Indicator = ((Boll+) – (Boll-)) / moving average

  Bollinger Bandwidth comparison between instruction and custom code

  a = BollingerBandWidth[20](close) b = (BollingerUp[20](close)-BollingerDown[20](close))/average[20] return a , b

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  a = BollingerBandWidth[20](close) b = (BollingerUp[20](close)-BollingerDown[20](close))/average[20]   return a , b

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  Nicolas

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  11/29/2022 at 11:42 AM #205009
  robertogozzi

  I misunderstood the text. Sorry.

   

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  robertogozzi

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  12/05/2022 at 1:21 PM #205276
  ZeroCafeine

  tks you all,

  so when I red the fonction’s name of : “BollingerBandWidth” I understood it’s the difference betwen the 2 bollinger band like : BB Up – BB Down, but this is not the case,

  tks again,
  Best Reguards

  

  ZeroCafeine

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