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Force Index

Created by Alexander Elder, the Force Index depicts volume-based buying and selling pressure based on the change in price. [Discuss] 💬

chart for Force Index

// C# usage syntax
IEnumerable<ForceIndexResult> results =
  quotes.GetForceIndex(lookbackPeriods);

Parameters

lookbackPeriods int - Lookback window (N) for the EMA of Force Index. Must be greater than 0 and is commonly 2 or 13 (shorter/longer view). Default is 2.

Historical quotes requirements

You must have at least N+100 for 2×N periods of quotes, whichever is more, to cover the warmup and convergence periods. Since this uses a smoothing technique for EMA, we recommend you use at least N+250 data points prior to the intended usage date for better precision.

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

Response

IEnumerable<ForceIndexResult>

This method returns a time series of all available indicator values for the quotes provided.
It always returns the same number of elements as there are in the historical quotes.
It does not return a single incremental indicator value.
The first N periods for will be null since they cannot be calculated.

⚞ Convergence warning: The first N+100 periods will have decreasing magnitude, convergence-related precision errors that can be as high as ~5% deviation in indicator values for earlier periods.

ForceIndexResult

Date DateTime - Date from evaluated TQuote

ForceIndex double - Force Index

Utilities

See Utilities and helpers for more information.

Chaining

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

// example
var results = quotes
    .GetForceIndex(..)
    .GetEma(..);

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