Struct NonNormalCapabilityResult 

pub struct NonNormalCapabilityResult {
    pub lambda: f64,
    pub lambda_at_bound: bool,
    pub indices: Option<CapabilityIndices>,
}

Result of a Box-Cox-based non-normal capability analysis.

Fields

lambda: f64

The estimated optimal Box-Cox transformation parameter λ.

λ ≈ 0 corresponds to a log transform; λ = 1 is the identity (no transform); λ = 0.5 is approximately a square-root transform.

lambda_at_bound: bool

true when the likelihood maximum lies on an end of the λ search range: the likelihood was still rising there, so lambda is that range limit (exactly) rather than an interior estimate, and the transformed-scale indices are computed at a λ the data did not choose. Widen the range to find the unconstrained optimum.

indices: Option<CapabilityIndices>

Capability indices computed on the Box-Cox-transformed scale, or None when no specification limit was given (the transform alone was asked for).

Only the long-term indices (pp, ppk, ppu, ppl) are reported. cp, cpk, cpu and cpl are always None: they are defined against a within-subgroup sigma, and a flat observation vector carries no subgroup structure to estimate one from. cpm follows its usual rule (both limits and a target, on the transformed scale).

Trait Implementations

impl Clone for NonNormalCapabilityResult

fn clone(&self) -> NonNormalCapabilityResult

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NonNormalCapabilityResult

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

Formats the value using the given formatter.