Struct ChiSquaredDistribution 

pub struct ChiSquaredDistribution {
    pub degrees_of_freedom: i64,
    pub distribution_name: String,
    pub description: String,
}

Parameters of a chi-squared distribution.

The distribution of a sum of degrees_of_freedom squared standard normals; the reference distribution for variance and goodness-of-fit tests.

Fields

degrees_of_freedom: i64

Degrees of freedom k; must be ≥ 1.

distribution_name: String

Optional human-readable name; unused by the numerics, defaults to empty.

description: String

Optional human-readable description; unused by the numerics, defaults to empty.

Trait Implementations

impl Cdf for ChiSquaredDistribution

fn cdf(&self, x: f64) -> f64

Evaluates the cumulative distribution function at x.

impl Clone for ChiSquaredDistribution

fn clone(&self) -> ChiSquaredDistribution

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChiSquaredDistribution

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

Formats the value using the given formatter.

impl Default for ChiSquaredDistribution

fn default() -> ChiSquaredDistribution

Returns the “default value” for a type.

impl LogCdf for ChiSquaredDistribution

fn logsf(&self, x: f64) -> f64

Evaluates the natural log of the survival function, ln P(X > x).

fn logcdf(&self, x: f64) -> f64

Evaluates the natural log of the CDF, ln P(X ≤ x).

impl Moments for ChiSquaredDistribution

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

Returns the theoretical mean, or None if it is undefined.

fn variance(&self) -> Option<f64>

Returns the theoretical variance, or None if it is undefined.

impl Pdf for ChiSquaredDistribution

fn pdf(&self, x: f64) -> f64

Evaluates the probability density function at x.

impl Quantile for ChiSquaredDistribution

fn quantile(&self, p: f64) -> f64

Evaluates the quantile (inverse CDF) at probability p.

impl Sample for ChiSquaredDistribution

fn sample(&self, rng: &mut SplitMix64) -> f64

Draws one variate, advancing rng.