Struct WeightedVariance 

pub struct WeightedVariance { /* private fields */ }

Preview O(1)-space weighted population variance (West’s update).

Implementations

impl WeightedVariance

pub const fn new() -> Self

Create an empty weighted variance.

pub fn mean(&self) -> Option<f64>

Weighted mean, if any positive weight has been observed.

pub fn value(&self) -> Option<f64>

Population variance Σw(x-μ)² / Σw.

Trait Implementations

impl Clone for WeightedVariance

fn clone(&self) -> WeightedVariance

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WeightedVariance

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

Formats the value using the given formatter.

impl Default for WeightedVariance

fn default() -> WeightedVariance

Returns the “default value” for a type.

impl PartialEq for WeightedVariance

fn eq(&self, other: &WeightedVariance) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for WeightedVariance

impl WeightedStatistic for WeightedVariance

fn update_weighted(&mut self, value: f64, weight: f64) -> Result<(), RillError>

Incorporate a value with a caller-defined weight.

fn total_weight(&self) -> f64

Sum of accepted positive weights.

fn samples_seen(&self) -> u64

Number of accepted positive-weight observations.

fn reset(&mut self)

Reset values, total weight, and sample count.