Struct ProbPlot 

pub struct ProbPlot { /* private fields */ }

A normal probability plot (Q-Q plot against the standard normal).

Mirrors the reference ProbPlot for the default standard-normal distribution: the theoretical percentiles are the plotting positions (i - a) / (n + 1 - 2a) for i = 1..=n, the theoretical quantiles are the normal inverse-CDF of those percentiles, and the sample quantiles are simply the sorted data.

Implementations

impl ProbPlot

pub fn new(data: &[f64]) -> Self

Build a probability plot from data, using plotting-position parameter a = 0 (the reference default).

pub fn with_a(data: &[f64], a: f64) -> Self

Build a probability plot with an explicit plotting-position parameter a.

Common choices: 0.0 (Weibull, the default), 0.375 (Blom), 0.5 (Hazen).

pub fn nobs(&self) -> usize

Number of observations.

pub fn theoretical_percentiles(&self) -> Array1<f64>

The theoretical plotting positions (percentiles in (0, 1)).

p_i = (i - a) / (n + 1 - 2a) for i = 1..=n.

pub fn theoretical_quantiles(&self) -> Array1<f64>

The theoretical quantiles: the standard-normal inverse CDF of the plotting positions.

pub fn sample_quantiles(&self) -> Array1<f64>

The sample quantiles: the sorted data.

pub fn qqline_regression(&self) -> QqLine

The regression reference line (“r”): an ordinary least-squares fit of the sample quantiles on the theoretical quantiles (with intercept).

pub fn qqline_standardized(&self) -> QqLine

The standardized reference line (“s”): slope = sample standard deviation (population, 1/n), intercept = sample mean.

pub fn qqline_quartile(&self) -> QqLine

The quartile reference line (“q”): the line through the first and third quartiles of the sample versus the theoretical normal quartiles.

pub fn qqplot(&self) -> Figure

Render the Q-Q plot to a Figure: a scatter of (theoretical, sample) quantiles overlaid with the regression reference line.

Trait Implementations

impl Clone for ProbPlot

fn clone(&self) -> ProbPlot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProbPlot

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

Formats the value using the given formatter.