Struct EfficiencyRatio 

pub struct EfficiencyRatio { /* private fields */ }

Kaufman Efficiency Ratio indicator.

Implementations

impl EfficiencyRatio

pub fn new(lookback: usize) -> Result<Self, IndicatorError>

Create a new EfficiencyRatio with the specified lookback period.

Errors

Returns InvalidParameter if lookback is 0.

pub fn compute_ratio( &self, candles: &[Candle], ) -> Result<Decimal, IndicatorError>

Compute the ER from the last lookback candles.

Returns a single Decimal in [0, 1].

pub fn compute_from_closes( &self, closes: &[Decimal], ) -> Result<Decimal, IndicatorError>

Compute ER from a slice of close prices.

Requires at least lookback + 1 close prices (same as compute_ratio). Useful when only close prices are available (e.g., ring buffer).

pub fn lookback(&self) -> usize

The lookback period.

Trait Implementations

impl Clone for EfficiencyRatio

fn clone(&self) -> EfficiencyRatio

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EfficiencyRatio

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Indicator for EfficiencyRatio

fn name(&self) -> &str

The name of this indicator (e.g., “SMA(20)”).

fn warmup_period(&self) -> usize

Minimum number of candles required before output is valid.

fn compute(&self, candles: &[Candle]) -> Result<Series, IndicatorError>

Compute the indicator values from candle data.