AROON

Summary

Aroon reports how recently the highest high and lowest low occurred within a rolling window of length optInTimePeriod, as two 0-100 oscillators. Indicates trend strength and direction. Up near 100 = a very recent new high (strong uptrend); Down near 100 = a very recent new low. Up/Down crossovers signal trend shifts.

Formula

Up = 100*(period-(today-highestIdx))/period; Down = 100*(period-(today-lowestIdx))/period, where highestIdx/lowestIdx index the highest high / lowest low over the window [today-period .. today].

Inputs

inPriceHL — High and low price series

Outputs

outAroonDown — Recency of the lowest low (100 = it is the current bar, decaying as it ages)
outAroonUp — Recency of the highest high (100 = it is the current bar, decaying as it ages)

Parameters

optInTimePeriod — Lookback window length

Implementation

TA-Lib Definition: aroon.c · aroon.yaml

Native	File
C	`ta_AROON.c`
Rust	`aroon.rs`
Java	`Core.java`

TA-Lib is also available for Python, R and more using a wrapper.

References

Tushar S. Chande