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Relative Strength Index (RSI)

Created by J. Welles Wilder, the Relative Strength Index is an oscillator that measures strength of the winning/losing streak over N lookback periods on a scale of 0 to 100, to depict overbought and oversold conditions. [Discuss] 💬

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

Parameters

lookbackPeriods int - Number of periods (N) in the lookback period. Must be greater than 0. Default is 14.

Historical quotes requirements

You must have at least N+100 periods of quotes to cover the warmup and convergence periods. Since this uses a smoothing technique, we recommend you use at least 10×N 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<RsiResult>

• 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-1 periods will have null values since there’s not enough data to calculate.

⚞ Convergence warning: The first 10×N periods will have decreasing magnitude, convergence-related precision errors that can be as high as ~5% deviation in indicator values for earlier periods.

RsiResult

Date DateTime - Date from evaluated TQuote

Rsi double - Relative Strength Index

Utilities

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

See Utilities and helpers for more information.

Chaining

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

// example
var results = quotes
    .Use(CandlePart.HL2)
    .GetRsi(..);

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

// example
var results = quotes
    .GetRsi(..)
    .GetSlope(..);