When I use BBands period 20, dev 2.0 on M15, I change my timeframe to H1, That 20, 2.0 settings how changed on H1 timeframe?
Period 80? or else? And deviation 8.0? or else?
My question is wrong
BBands period 20, dev 2.0 on H1 is how about M15?
What the OP is asking about, is the use of the "equivalence ratio" of applying a moving average which will result in a similarity to a multi-time-frame indicator.
Yes Erdenebayar, you are partially correct! For a Bollinger Bands (which is based on a moving average), the period should be multiplied by the ratio between the two time-frames in order to compensate and obtain an equivalence.So for a 20 Period Bollinger Band on H1, the equivalent on M15 is 20 x H1 / M15 = 20 * 60 / 15 = 20 * 4 = 80 (as you mentioned).However, the Standard Deviation ratio should not be changed. It should remain at 2.0, as only the period needs to be adjusted.Here is a screen shot to show the comparison, with the "Zoom" scale altered on the M15 so you can easily compare the two:
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