Bollinger bands

re: my recent lament on using BB's I was reading the traders press re-print on John Bollinger's works last night and there are a couple of formulae that might be quite useful.

%B = (close - lowerband)/(upperband - lowerband)

B = (upperband - lowerband)/middleband

these give position relative to the upper and lower band and a measure of bandwidth.
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