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Elder-ray Index

Created by Alexander Elder, the Elder-ray Index, also known as Bull and Bear Power, is an oscillator that depicts buying and selling pressure. It compares current high/low prices against an Exponential Moving Average. [Discuss] 💬

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

Parameters

lookbackPeriods int - Number of periods (N) for the underlying EMA evaluation. Must be greater than 0. Default is 13.

Historical quotes requirements

You must have at least 2×N or N+100 periods of quotes, whichever is more, to cover the warmup and convergence periods. Since this uses a smoothing technique, 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<ElderRayResult>

• 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 indicator values since there’s not enough data to calculate.

⚞ 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.

ElderRayResult

Date DateTime - Date from evaluated TQuote

Ema double - Exponential moving average

BullPower double - Bull Power

BearPower double - Bear Power

Utilities

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

See Utilities and helpers for more information.

Chaining

Results can be further processed on (BullPower+BearPower) with additional chain-enabled indicators.

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

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