Price Momentum Oscillator (PMO)

Created by Carl Swenlin, the DecisionPoint Price Momentum Oscillator is double-smoothed momentum indicator based on Rate of Change (ROC). [Discuss] 💬

// C# usage syntax
IReadOnlyList<PmoResult> results =
  bars.ToPmo(timePeriods, smoothPeriods, signalPeriods);

Parameters

param	type	description
timePeriods	int	Number of periods (T) for first ROC smoothing. Must be greater than 1. Default is 35.
smoothPeriods	int	Number of periods (S) for second PMO smoothing. Must be greater than 0. Default is 20.
signalPeriods	int	Number of periods (G) for Signal line EMA. Must be greater than 0. Default is 10.

Historical price bars requirements

You must have at least N periods of bars, where N is the greater of T+S, 2×T, or T+100 to cover the warmup and convergence periods. Since this uses multiple smoothing operations, we recommend you use at least N+250 data points prior to the intended usage date for better precision.

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<PmoResult>

• 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 T+S-1 periods will have null values for PMO since there's not enough data to calculate.

🚩 ⚞ Convergence warning

The first T+S+250 periods will have decreasing magnitude, convergence-related precision errors that can be as high as ~5% deviation in indicator values for earlier periods.

PmoResult

property	type	description
Timestamp	DateTime	Date from evaluated TBar
Pmo	double	Price Momentum Oscillator
Signal	double	Signal line is EMA of PMO

Utilities

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

See Utilities and helpers for more information.

Chaining

This indicator may be generated from any chain-enabled indicator or method.

// example
var results = bars
    .Use(CandlePart.HL2)
    .ToPmo(..);

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

// example
var results = bars
    .ToPmo(..)
    .ToRsi(..);

See Chaining indicators for more.

Streaming

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

PmoList pmoList = new(timePeriods, smoothPeriods, signalPeriods);

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

// based on `ICollection<PmoResult>`
IReadOnlyList<PmoResult> results = pmoList;

Subscribe to a BarHub for advanced streaming scenarios:

BarHub barHub = new();
PmoHub observer = barHub.ToPmoHub(timePeriods, smoothPeriods, signalPeriods);

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

IReadOnlyList<PmoResult> results = observer.Results;

See Buffer lists and Stream hubs for full usage guides.