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Calculating Narrowest Trading Range



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Can anyone help me with this formula. I'm trying to do
the following:

Determine that today's trading range is the narrowest
for the last four days.

today's trading range: i.e. If today's high-low <
(high
-low)yesterday, and (high -low)two days ago, and (high
-low)three days ago, and (high -low)four days ago then
then plot 1, otherwise 0


I had been playing around with HHV,and LLV functions
but these didn't quite work, because I needed to
determine each of the previous days trading ranges. 

Thanks,
Joe


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