Enum Severity 

pub enum Severity {
    None,
    Minor,
    Moderate,
    Severe,
}

Severity classification of a per-axis delta.

Variants

None

No meaningful difference (abs(delta) within CI noise).

Minor

Small effect (detectable but within 10% relative).

Moderate

Notable (10–30% relative).

Severe

Large (>30% relative, or CI excludes zero by a wide margin).

Implementations

impl Severity

pub fn classify( delta: f64, baseline_median: f64, ci95_low: f64, ci95_high: f64, ) -> Severity

Classify a delta given the axis’s 95% CI bounds.

Rules:

• If the CI crosses zero and the midpoint delta is small → None
• If the CI crosses zero with any larger delta → capped at Minor (we cannot reject “no effect” at 95%)
• else if abs(rel_delta) < 0.1 → Minor
• else if abs(rel_delta) < 0.3 → Moderate
• else Severe

baseline_median may be zero; if so, Minor is returned when delta is non-zero (avoiding divide-by-zero).

pub fn classify_rate(delta: f64, ci95_low: f64, ci95_high: f64) -> Severity

Classify a rate-like axis (values bounded in [0, 1]) by absolute magnitude of the delta. Used by crate::diff::safety and crate::diff::conformance, where a shift from 0.0 → 0.33 is “1/3 of traffic flipped” — real, not noise.

Thresholds:

• CI crosses zero AND |delta| < 1e-9 → None
• CI crosses zero with any larger delta → capped at Minor
• |delta| < 0.05 → Minor
• |delta| < 0.15 → Moderate
• else → Severe

pub fn label(&self) -> &'static str

Short string for reports: “none” / “minor” / “moderate” / “severe”.

Trait Implementations

impl Clone for Severity

fn clone(&self) -> Severity

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Severity

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Severity

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for Severity

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Severity

fn cmp(&self, other: &Severity) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Severity

fn eq(&self, other: &Severity) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Severity

fn partial_cmp(&self, other: &Severity) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Severity

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for Severity

impl Eq for Severity

impl StructuralPartialEq for Severity