Struct RollingVariance 

pub struct RollingVariance { /* private fields */ }

Rolling variance over a fixed-size window.

Uses VarianceKind to select population or sample variance. The window contents are stored and the variance recomputed on each query.

Implementations

impl RollingVariance

pub fn new(capacity: usize, kind: VarianceKind) -> Result<Self, RillError>

Create a new rolling variance accumulator.

Returns an error if capacity is zero.

pub const fn capacity(&self) -> usize

The configured window capacity.

pub const fn kind(&self) -> VarianceKind

The configured variance kind.

pub fn len(&self) -> usize

Number of observations currently in the window.

pub fn is_empty(&self) -> bool

Whether the window is currently empty.

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

Current rolling mean, or None if the window is empty.

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

Current rolling variance, or None when not enough data is in the window.

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

Current rolling standard deviation, or None when not enough data.

Trait Implementations

impl Clone for RollingVariance

fn clone(&self) -> RollingVariance

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RollingVariance

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

Formats the value using the given formatter.

impl OnlineStatistic for RollingVariance

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

Update the statistic with a new observation.

fn samples_seen(&self) -> u64

How many observations have been incorporated.

fn reset(&mut self)

Reset the statistic.