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Bollinger - calculate volatility ?

Hello everyone, I'd like some help, a formula to "calculate" volatility on bollinger. I assume there is something like "(TopBand - BottomBand) / MiddleBand * XXX" ? Do someone has an answer ? The idea behind that would be to get an alert when volatility get higher than x% or xvalue (i don't know)

Calculate lot size

Hello Everyone, I'm new here, long time ago I used to be a programmer - changed my mind but I restarted a few weeks ago to build my own trading script. I'm used to stock markets - not with Forex - but I did read a lot about it, and try to understand everything I've read. I've got good notions about