RelativeMomentumIndex

Commonly abbreviated as RMI.
Is a momentum indicator.
Was developed by Roger Altman.
Is computed using close prices.
Returns one time series, which is the ratio of 14-period exponential moving averages for gains and losses over 5 periods, rescaled to be between 0 and 100.
FinancialIndicator["RelativeMomentumIndex",n1,n2] computes gains and losses over periods and period- moving averages.
The first value in the time series occurs after periods.