Struct ExternalExpectationsConfig 

pub struct ExternalExpectationsConfig {
    pub enabled: bool,
    pub driver: ExpectationDriver,
    pub tolerance_pct: f64,
    pub forecast_noise: f64,
    pub growth_rate: f64,
    pub min_materiality_share: f64,
}

External-expectation (ISA-520 substantive-analytics) configuration.

When enabled, the engine emits, per material GL account, an expected period total derived from an exogenous driver (prior-year / market / macro / budget) plus a materiality tolerance band, with the realized deviation and the ground-truth fraud contribution. This is the Phase-2 substantive- analytics layer — the engine-side counterpart to the perfect-crime countermeasure (see docs/phase2-ledger-evidence-assurance.md).

Fields

enabled: bool

Enable external-expectation generation.

driver: ExpectationDriver

Exogenous driver the expectation is built on.

tolerance_pct: f64

Materiality tolerance band as a fraction of the expectation (the ISA-520 investigate threshold).

forecast_noise: f64

Forecast-error std (fraction) of the auditor’s expectation around the legitimate level — models imperfect expectations, producing realistic false positives on volatile accounts.

growth_rate: f64

Expected period-over-period growth used to frame the driver (e.g. prior-year × (1 + growth)).

min_materiality_share: f64

Only accounts whose legitimate share of total activity is at least this fraction are scored — substantive analytics targets material balances.

Trait Implementations

impl Clone for ExternalExpectationsConfig

fn clone(&self) -> ExternalExpectationsConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExternalExpectationsConfig

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

Formats the value using the given formatter.

impl Default for ExternalExpectationsConfig

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ExternalExpectationsConfig

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ExternalExpectationsConfig

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

where __S: Serializer,

Serialize this value into the given Serde serializer.