Struct mathru::stats::distrib::ChiSquared

pub struct ChiSquared { /* fields omitted */ }

Chi-Squared distribution

Fore more information: https://en.wikipedia.org/wiki/Chi-squared_distribution

Methods

impl ChiSquared

pub fn new(df: &u32) -> ChiSquared

Creates a probability distribution

Arguments

• df: Degree of freedom, df >= 1

Panics

if df < 1

Example

extern crate mathru;
use mathru::stats::distrib::ChiSquared;

let distrib: ChiSquared = ChiSquared::new(&3);

Trait Implementations

impl Continuous<f64, f64> for ChiSquared

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

Probability density function

Arguments

• x Random variable x ∈ &#x2115

Example

extern crate mathru;
use mathru::stats::distrib::{Continuous, ChiSquared};

let distrib: ChiSquared = ChiSquared::new(&2);
let x: f64 = 5.0;
let p: f64 = distrib.pdf(x);

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

Cumulative distribution function

Arguments

• x Random variable

Example

extern crate mathru;
use mathru::stats::distrib::{Continuous, ChiSquared};

let distrib: ChiSquared = ChiSquared::new(&3);
let x: f64 = 0.4;
let p: f64 = distrib.cdf(x);

fn quantile<'a, 'b>(&'a self, p: f64) -> f64

Quantile function of inverse cdf

fn mean<'a>(&'a self) -> f64

Expected value

Example

extern crate mathru;
use mathru::stats::distrib::{Discrete, Bernoulli};

let distrib: Bernoulli = Bernoulli::new(0.2);
let mean: f64 = distrib.mean();

fn variance<'a>(&'a self) -> f64

Variance

Example

extern crate mathru;
use mathru::stats::distrib::{Discrete, Bernoulli};

let distrib: Bernoulli = Bernoulli::new(0.2);
let var: f64 = distrib.variance();