Struct AttributeChartPoint 

pub struct AttributeChartPoint {
    pub index: usize,
    pub value: f64,
    pub ucl: f64,
    pub cl: f64,
    pub lcl: f64,
    pub out_of_control: bool,
    pub z: Option<f64>,
}

A single data point on an attributes control chart.

Contains the computed statistic, its control limits (which may vary per point for charts with variable sample sizes), and an out-of-control flag.

Fields

index: usize

The zero-based index of this point.

value: f64

The computed statistic value (proportion, count, or rate).

ucl: f64

Upper control limit for this point.

cl: f64

Center line for this point.

lcl: f64

Lower control limit for this point.

out_of_control: bool

Whether this point is out of control (beyond UCL or below LCL).

z: Option<f64>

The point on the standardized scale, (value − cl) / σᵢ, where σᵢ is this point’s own standard error (the limits are cl ± 3σᵢ, before the lower one is clamped at 0). None when σᵢ is 0.

When sample sizes vary the limits vary with them, so zone-based run rules have no single set of zones on the original scale. On this scale the limits are ±3 for every point: pass these values to RunRules with limits (3, 0, −3) — the standardized control chart (Montgomery 2019, §7.2.2).

Trait Implementations

impl Clone for AttributeChartPoint

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AttributeChartPoint

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

Formats the value using the given formatter.