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Duration Analysis?



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Has anyone worked with this concept?  Any specifics as to how it's
calculated and quantified?
    
The following was posted to one the TSC forums:   
      
"Tom DeMark's book, New Market Timing Techniques, explores a concept called
"duration analysis."   He uses duration analysis to determine whether or not
an overbought/oversold condition on an oscillator is indicating price
reversal or price continuation.  According to his work, a "mild" overbought
condition (i.e., one that lasts less than five to six consecutive days)
precedes price reversal, whereas a "severe" condition (i.e., one that lasts
more than six consecutive days) precedes price continuation. 
       
Obviously, there's a little more to it than that, but you get the idea.
(Interestingly, my charting of the S&P just fulfilled the severe criteria
last Friday).  It's a fairly simple concept, although the book itself is
pretty darn complex."