Bollinger Bands Middle Band

Bollinger Bands Middle Band
Bollinger bands can be applied to virtually any market or security. For all markets and problems, I would use a 20-day calculation period as a starting point and only stray from it when circumstances forced me to do it. As we extend the number of periods involved, should increase the number of employed standard deviations. At 50 times, two and a half standard deviations are a good choice, while at 10 times one and a half to do the job quite well.
50 periods with 2.5 standard deviation of 10 periods with 1.5 standard deviation
Upper range = 50 day-SMA + 2.5 (a)
Middle Band = 50-SMA day
Lower Band = 50 day-SMA - 2.5 (a) upper band = 10-day SMA + 1.5 (a)
Middle Band = 10-day SMA
Lower Band = 10-day SMA - 1.5 (a)
In most cases, the nature of the periods is immaterial; seems that all the answers precise Bollinger bands. I use the monthly and quarterly data, and I know many traders apply the intraday basis.