Struct Beta 

pub struct Beta { /* private fields */ }

Beta distribution, conjugate prior for binomial likelihood.

After observing s successes in n trials, the posterior is Beta(α + s, β + n − s).

Implementations

impl Beta

pub fn new(alpha: f64, beta: f64) -> Result<Self>

Create a Beta distribution with shape parameters alpha and beta.

Both must be positive.

pub fn alpha(&self) -> f64

Alpha parameter.

pub fn beta(&self) -> f64

Beta parameter.

pub fn update_binomial(&self, successes: u64, trials: u64) -> Self

Compute the posterior after observing binomial data.

Trait Implementations

impl Clone for Beta

fn clone(&self) -> Beta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Beta

impl Debug for Beta

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

Formats the value using the given formatter.

impl Distribution for Beta

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

Probability density (or mass) function at x.

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

Cumulative distribution function at x.

fn mean(&self) -> f64

Distribution mean.

fn variance(&self) -> f64

Distribution variance.

fn std_dev(&self) -> f64

Distribution standard deviation (default: sqrt of variance).