Struct LaneyAttributePoint 

pub struct LaneyAttributePoint {
    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 for a Laney P’ or U’ chart.

Laney charts correct for overdispersion or underdispersion by estimating a process sigma-inflation factor φ from the moving range of standardized subgroup statistics.

References

• Laney, D.B. (2002). “Improved control charts for attributes”, Quality Engineering 14(4), pp. 531-537.

Fields

index: usize

Zero-based index of this subgroup.

value: f64

The observed statistic (proportion or defect rate) for this subgroup.

ucl: f64

Upper control limit (overdispersion-adjusted).

cl: f64

Center line (overall mean proportion or rate).

lcl: f64

Lower control limit (overdispersion-adjusted, clamped to 0).

out_of_control: bool

Whether this point lies beyond its control limits.

z: Option<f64>

The point on the standardized scale, (value − cl) / (φ·σᵢ) — the scale on which every limit is ±3. None when φ·σᵢ is 0. See AttributeChartPoint::z for using it with zone-based run rules.

Trait Implementations

impl Clone for LaneyAttributePoint

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 LaneyAttributePoint

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

Formats the value using the given formatter.