Aroon

Created by Tushar Chande, Aroon (Up/Down) is a oscillator view that tracks how recently each lookback window saw a new high (Up) and low (Down). Aroon Oscillator is the difference Up − Down, presented as a single oscillator that crosses zero when the dominant trend flips. [Discuss] 💬

// C# usage syntax
IReadOnlyList<AroonResult> results =
  bars.ToAroon(lookbackPeriods);

Parameters

param	type	description
lookbackPeriods	int	Number of periods (N) for the lookback evaluation. Must be greater than 0. Default is 25.

Historical price bars requirements

You must have at least N periods of bars to cover the warmup periods.

bars is a collection of generic TBar historical price bars. It should have a consistent frequency (day, hour, minute, etc). See the Guide for more information.

Response

IReadOnlyList<AroonResult>

• This method returns a time series of all available indicator values for the bars provided.
• It always returns the same number of elements as there are in the historical price bars.
• It does not return a single incremental indicator value.
• The first N-1 periods will have null values for Aroon since there's not enough data to calculate.

AroonResult

property	type	description
Timestamp	DateTime	Date from evaluated TBar
AroonUp	double	Based on last High price
AroonDown	double	Based on last Low price
Oscillator	double	AroonUp - AroonDown

Utilities

• .Condense()
• .Find(lookupDate)
• .RemoveWarmupPeriods()
• .RemoveWarmupPeriods(removePeriods)

See Utilities and helpers for more information.

Chaining

Results can be further processed on Oscillator with additional chain-enabled indicators.

// example
var results = bars
    .ToAroon(..)
    .ToSlope(..);

This indicator must be generated from bars and cannot be generated from results of another chain-enabled indicator or method.

See Chaining indicators for more.

Streaming

Use the buffer-style List<T> when you need incremental calculations without a hub:

AroonList aroonList = new(lookbackPeriods);

foreach (IBar bar in bars)  // simulating stream
{
  aroonList.Add(bar);
}

// based on `ICollection<AroonResult>`
IReadOnlyList<AroonResult> results = aroonList;

Subscribe to a BarHub for advanced streaming scenarios:

BarHub barHub = new();
AroonHub observer = barHub.ToAroonHub(lookbackPeriods);

foreach (IBar bar in bars)  // simulating stream
{
  barHub.Add(bar);
}

IReadOnlyList<AroonResult> results = observer.Results;

See Buffer lists and Stream hubs for full usage guides.