Approximate-leave-one-out (ALO) REML-evidence diagnostics. Descended from the
monolith inference::alo (#1521): its only dependencies are the gam-solve
estimate/pirls/sensitivity/mixture_link modules plus gam-linalg
and gam-problem — all at or below the gam-solve tier.
Higher-order likelihood asymptotics for likelihood-ratio tests (issue #939):
Bartlett corrections that make the first-order χ² reference distribution
second-order accurate at modest n and near-boundary λ.
Honest, calibrated model comparison computed from machinery already present
at the fit optimum — exact smoothing-corrected conditional AIC and zero-refit
ALO elpd with an influence diagnostic (issue #946).
Deterministic Pólya–Gamma gate-block evidence (#1016): Schur-eliminates a
logit gate sub-block with a true PG-augmented quadratic. Descended from the
monolith inference::pg_gate_evidence (#1521): depends only on
gam-linalg (matrix::FactorizedSystem, faer_ndarray) plus the in-crate
pg_moments. Reached downward from gam_sae::structure_harvest; the
monolith crate root re-exports it so gam::inference::pg_gate_evidence
resolves unchanged.
Deterministic Pólya–Gamma gate-block evidence for logit SAE gates (#1016).
Closed-form Pólya–Gamma moments (#1016). Pure functions of (b, c) with no
RNG. Descended from the monolith inference::pg_moments (#1521); the
monolith crate root re-exports it so gam::inference::pg_moments resolves
unchanged.
Analytic Pólya–Gamma moments for deterministic gate-block evidence
approximations (#1016).
#1521: the quadrature implementation was carved into gam-solve. The root
gam crate re-exports it so crate::quadrature::* (and crate::quadrature)
resolve to the single canonical gam_solve::quadrature types — eliminating the
stale monolith duplicate of QuadratureContext that diverged from the carved copy.
Structured residual-covariance estimator (#974) and the single producer of
MetricProvenance::WhitenedStructured.
Descended from the monolith inference::residual_factor (#1521): its only
dependencies are gam_problem::RowMetric plus gam-linalg
(faer_ndarray::{FaerCholesky, FaerEigh}) — all at or below the gam-solve
tier. Reached downward from gam_sae::structure_harvest; the monolith crate
root re-exports it so gam::inference::residual_factor resolves unchanged.
#974 — the structured-residual covariance estimator and the single producer
of MetricProvenance::WhitenedStructured.
Exact marginal smoothing inference over the smoothing parameters ρ
(issue #938): the Tier-0 PSIS certificate, plus the auto-selected
escalation tiers — Tier-1 Gauss-Hermite quadrature over ρ (K ≤ 4,
rho_posterior_quadrature) and Tier-2 NUTS over ρ with the exact
profiled gradient (K ≤ 16, rho_posterior_nuts), routed by
escalate_rho_posterior when the certificate refuses to certify the
plug-in.