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This page contains the formula for Mass Index and you can download the formula in Excel spreadsheet.

Mass Index was invented by Donald Dorsey, it predict reversals by comparing the trading range for each periods.

Mass Index

Formula:

x = High - Low
y = EMA-9 (x)
z = EMA-9 (y)
a = y / z
Mass Index = Sum (a) for selected number of periods

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