BollingerBands implementation

trend_meanreversion
02 Nov 2017, 08:28 ( Updated at: 21 Dec 2023, 09:20 )

RE:

trend_meanreversion said:

Hi cAlgo/cTrader team,

I recently observed that your bollinger bands indicator can move out of sync of what i would have understood otherwise.

I mean i expected BB to move in parallel by basic defintions ..something like below

• Middle Band = 20-day simple moving average (SMA)
• Upper Band = 20-day SMA + (20-day standard deviation of price x 2)
• Lower Band = 20-day SMA – (20-day standard deviation of price x 2)

But your implementation can give Upper Band moving lower while Lower Band moving higher or flat at times. Can you please explain why it should happen. I am not questioning but trying to understand how are you calculating upper and lower bands

 

Sorry ignore it..what a stupid question !! ...need some sleep :)