Struct PopulationStabilityIndexDetector 

pub struct PopulationStabilityIndexDetector { /* private fields */ }

Population Stability Index (PSI) for measuring distribution shift.

PSI is computed by binning both distributions and comparing the bin proportions:

PSI = sum_i (p_i - q_i) * ln(p_i / q_i)

Interpretation: PSI < 0.1 → negligible, 0.1-0.25 → moderate, > 0.25 → significant.

Implementations

impl PopulationStabilityIndexDetector

pub fn new(n_bins: usize, threshold: f64) -> Result<Self>

Create a new PSI detector.

• n_bins – number of equal-width bins (default: 10)
• threshold – PSI value above which drift is declared (default: 0.25)

pub fn default_config() -> Self

Create with default settings (10 bins, threshold 0.25).

Trait Implementations

impl Clone for PopulationStabilityIndexDetector

fn clone(&self) -> PopulationStabilityIndexDetector

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PopulationStabilityIndexDetector

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

Formats the value using the given formatter.

impl DriftDetector for PopulationStabilityIndexDetector

fn detect(&self, reference: &[f64], test: &[f64]) -> Result<DriftResult>

Compare a reference distribution against a test distribution.