Mass Index (MI)

Mass Index (MI)

The Mass Index indicator, developed by Donald Dorsey, uses the bar range to identify trend reversals based on range expansions. It is more of a volatility indicator as it does not have a directional bias. It identifies trending and congession areas, which can occur before change in trend.

Configuration Options

  • Period: Number of bars to use in the calculations.
  • Bulge Threshold: TBD
  • Color Selectors: Colors to use for graph elements.
  • Display Axis Label: Whether to display the most recent value on the Y axis.


\[EMA_{1} = 9-period\;EMA\;of\;the\;range\;(H-L)\]

\[DEMA_{1} = 9-period\;EMA_{1}\]

\[EMA Ratio = \frac{EMA_{1}}{DEMA_{1}}\]

\[MI = 25-period\;sum\;of\;the\;EMA\;Ratio\]