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Trying to scan for a large one-day move in Bollinger Band Width
The Bollinger Band 'Width' indicator seems to subtract the Lower Bollinger Band @ default setting of (20,2) from the Upper Bollinger Band @ default setting of (20,2). It appears to just return that integer number value. For instance, if the Upper Band = 25 and the Lower Band = 16 then with Width for that day = 9.
I'm trying to write a scan to find this condition:
1.5 * today's Bollinger Band Width > Yesterday's Bollinger Band Width
1.49 * today's Bollinger Band Width < Yesterday's Bollinger Band Width.
I'm trying to scan for a LARGE one-day change in the Width number. I can't make the scan engine like the word 'AND' no matter how I type this in.
Any hints or suggestion from better programmers than me? which is most people, FYI.