This is a follow-on from https://www.quantopian.com/posts/bollinger-bands. The code is not complete, but the idea is to flesh it out for application to so-called Bollinger Bands (from what I've gathered so far, a set of analysis/trading tools based on security price z-scores). I see that sometimes Exponential Bollinger Bands are used (if anyone has details/links on the exponential type, please share).
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