Smoothed moving average (RMA)
Wilder's slow running average — the one inside RSI, ATR and ADX.
It is an EMA with k = 1 ÷ N instead of 2 ÷ (N + 1), which is why an 'RSI 14' computed with a standard EMA is a different line.
Formula
RMA = RMAₚᵣₑᵥ + (Price − RMAₚᵣₑᵥ) ÷ N
How to use it
A slow, steady trend line — the same smoothing RSI and ATR use inside.
In Kereon
Charts · Superchart. Default length 14, seeded with the simple average of the first window.
Also called: rma, wilder, smoothed, running moving average.