Kaufman Adaptive Moving Average
KAMA(expr, erlen, fastest, slowest)
expr - data series formula
erlen - lookback length for the Efficiency Ratio calculation used to adapt the EMA length
fastest - shortest EMA equivalent lookback period
slowest - longest EMA equivalent lookback period
KAMA is a kind of exponential moving average which adapts its weighting factor (often mistaken for a lookback length) at each bar of its calculation by computing the Kaufman Efficiency Ratio and using that to determine that bar's weighting.
The most common parameters are KAMA(expr, 10, 2, 30).
See stockcharts.com for further details.
This function supports ultra-fast one-pass calculation when used in the Data Section with non-variable length parameters.