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Investor/RT Tour ( more on Technical Indicators )
Tom DeMark Range Expansion Index (TD REI)
The Formula . . . 

. . .more on Formulas 

IF( ( (HI>=LO5 OR HI>=LO6) AND (LO<=HI5 OR LO<=HI6) ) OR
      ( (HI2>=CL7 OR HI2>=CL8) AND (LO2<=CL7 OR LO2<=CL8) ) )
THEN   
   VALUE = HI - HI2 + LO - LO2
   ABSVALUE = ABS(HI - HI2) + ABS(LO - LO2)
ELSE    VALUE = ABSVALUE = 0

TD_REI = SUM(VALUE, N) / SUM(ABSVALUE, N)

where N is the the TD_REI Period

 
The Presentation . . . 

. . . more on Charts 

Tom DeMark's Range Expansion Index

Above is a Daily Chart of an AOL May 70 Call (AOO EN).  The bold green line in the lower window pane represents the TD REI line, as specified in the preferences below.

 
The Preferences . . . 

. . . more on Preferences 

Tom DeMark's Range Expansion Index Preferences

  • Period - Period over which the TD REI values are summed.

  • Draw 45% Lines - If this checkbox is checked, reference lines will be drawn at the 45% and -45% levels.

  • TD REI Color - Color of the resulting TD REI line.

 
The Description . . .
The DeMark Range Expansion Index is a market-timing oscillator described in DeMark on Day Trading Options, by T.R. DeMark and T.R. Demark, Jr., McGraw Hill, 1999. The oscillator is arithmetically calculated and is designed to overcome problems with exponentially calculated oscillators, like MACD. The TD REI oscillator typically produces values of -100 to +100 with 45 or higher indicating overbought conditions and -45 or lower indicating oversold. DeMark advises against trading in extreme overbought or oversold conditions indicated by six or more bars above or below the 45 thresholds. For more information on using TD REI the user is referred to the DeMark text.

See also: