Struct OutcomeStats 

pub struct OutcomeStats { /* private fields */ }

Running statistics using Welford’s online algorithm.

Maintains count, mean, and M2 (sum of squared differences) for numerically stable variance computation.

Implementations

impl OutcomeStats

pub fn new(dim: usize) -> Self

Create new empty statistics for given dimension.

pub fn update(&mut self, outcome: &[f32])

Update statistics with a new observation (Welford’s algorithm).

Panics

Panics if outcome.len() != self.dim().

pub fn merge(&self, other: &Self) -> Self

Merge two statistics objects (parallel Welford).

Useful for combining statistics computed in parallel.

pub fn update_scalar(&mut self, value: f64)

Update with a single scalar value (1D convenience method).

pub const fn count(&self) -> u64

Number of observations.

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

Get the scalar mean (for 1D stats).

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

Get the scalar variance (for 1D stats).

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

Get the scalar std (for 1D stats).

pub fn dim(&self) -> usize

Dimension of outcome vectors.

pub fn mean(&self) -> Option<&[f32]>

Current mean estimate (None if no observations).

pub fn variance(&self) -> Option<Vec<f32>>

Population variance (None if < 2 observations).

pub fn std(&self) -> Option<Vec<f32>>

Population standard deviation (None if < 2 observations).

pub fn sample_variance(&self) -> Option<Vec<f32>>

Sample variance with Bessel’s correction (None if < 2 observations).

pub fn min(&self) -> Option<&[f32]>

Minimum observed values (None if no observations).

pub fn max(&self) -> Option<&[f32]>

Maximum observed values (None if no observations).

pub fn confidence_interval( &self, confidence: f32, ) -> Option<(Vec<f32>, Vec<f32>)>

Compute confidence interval for the mean.

Uses t-distribution for small samples (< 30), normal for large. Returns (lower, upper) bounds.

Trait Implementations

impl Clone for OutcomeStats

fn clone(&self) -> OutcomeStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OutcomeStats

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

Formats the value using the given formatter.

impl Default for OutcomeStats

fn default() -> Self

Returns the “default value” for a type.