Struct BetaBinomial 

pub struct BetaBinomial {
    pub alpha: f64,
    pub beta: f64,
}

Beta-Binomial conjugate pair

Prior: Beta(α, β) Likelihood: Binomial(n, p) Posterior: Beta(α + successes, β + failures)

Fields

alpha: f64

Alpha parameter of the Beta prior

beta: f64

Beta parameter of the Beta prior

Implementations

impl BetaBinomial

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

Create a new Beta-Binomial conjugate prior

pub fn update(&self, successes: usize, failures: usize) -> Self

Update the prior with observed data

Arguments

• successes - Number of successes observed
• failures - Number of failures observed

Returns

Updated BetaBinomial with posterior parameters

pub fn posterior_mean(&self) -> Result<f64>

Compute the posterior mean

pub fn posterior_variance(&self) -> Result<f64>

Compute the posterior variance

pub fn posterior_mode(&self) -> Result<Option<f64>>

Compute the posterior mode (MAP estimate)

pub fn credible_interval(&self, confidence: f64) -> Result<(f64, f64)>

Compute credible interval

Trait Implementations

impl Clone for BetaBinomial

fn clone(&self) -> BetaBinomial

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BetaBinomial

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

Formats the value using the given formatter.