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Bollinger Band Width



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I'm horrible at programming language for formulas.  Can anyone
help me with a simple formula to track the daily width of a 20
period Bollinger Band 
(a simple line defining the "spread" between the top and bottom
band would be great).  I'm trying to track the net difference of
the bands as they narrow and widen.  Recently, with help from
the forum, I was able to formulate Bollinger Bands into a
Histogram.  Suddenly, the bands started to  make a lot more
sense.   This new "look" compliments work that I do with
regression oscillators, RSI, % of R, and candlesticks.  New
tools are great, especially when they point to profits.  

Thanks to any and all that can help,
Steve Karnish
CCT