Struct NelsonRules 

pub struct NelsonRules;

Nelson rules (8 rules) – RuleSet::nelson.

The full set of eight tests for special causes as defined by Nelson (1984). Rules 1, 5 and 6 are also Western Electric rules; Rule 2 (nine points on one side) is a longer run than Western Electric’s eight.

Examples

use u_analytics::spc::{NelsonRules, RunRule, ChartPoint, ControlLimits};

let limits = ControlLimits { ucl: 28.0, cl: 25.0, lcl: 22.0 };
let points: Vec<ChartPoint> = vec![
    ChartPoint { value: 25.0, index: 0, violations: vec![] },
    ChartPoint { value: 29.0, index: 1, violations: vec![] },
];

let violations = NelsonRules.check(&points, &limits);
assert!(!violations.is_empty()); // Rule 1: point beyond UCL

Trait Implementations

impl RunRule for NelsonRules

fn check( &self, points: &[ChartPoint], limits: &ControlLimits, ) -> Vec<(usize, ViolationType)>

Apply all 8 Nelson run rules.