v0.4.0

ConvolvedDistributions v0.4.0

Diff since v0.3.1

Breaking changes

• The continuous-delay error gate in convolve_series has been removed. A continuous delay is now a plain MethodError where it was previously a checked ArgumentError.

New types

• Ratio type and ratio verb (Z = X / Y): the ratio of two independent non-negative distributions, using Gauss–Legendre quadrature. Supports pdf, cdf, quantile, rand, minimum/maximum, and all AD backends.

New features

• pgf — probability generating function primitive for discrete distributions, with closed forms for standard count families (Poisson, Bernoulli, Binomial, Geometric, NegativeBinomial) and a truncated-series fallback for any DiscreteUnivariateDistribution.
• quantile_by_optimization — shared numeric quantile inversion, usable from downstream packages and from the ConvolvedDistributionsOptimizationExt extension for Convolved, Difference, Product, and Ratio.
• Time-varying delays — convolve_series now accepts a vector of per-time-point delays (or delay-mass pairs), dispatching element-by-element. Supports both discrete and caller-supplied mass vectors.

Refactoring

• Internal renames: _causal_convolve → _convolve_series_fixed, _convolve_series → _convolve_series_varying
• The masses hook is now public API.

Documentation

• New product-distributions tutorial page
• PGF documentation in the module docstring
• FAQ entries for dispatch and solver selection

Maintenance

• Dependency updates (JET, GitHub Actions)
• Version increment: 0.3.2 → 0.4.0

Merged pull requests:

• chore: auto-increment version to 0.3.2 (#123) (@github-actions[bot])
• ci(deps): bump the github-actions group with 9 updates (#128) (@dependabot[bot])
• chore(deps): update JET requirement from 0.9, 0.10, 0.11 to 0.9, 0.10, 0.11, 0.12 in the julia group (#129) (@dependabot[bot])
• Time-varying delays for convolve_series, and drop the continuous error gate (#126, #95) (#130) (@seabbs-bot)
• feat: shared numeric quantile inversion, quantile_by_optimization (#112) (#131) (@seabbs-bot)
• feat: add pgf primitive (#90) (#134) (@seabbs-bot)
• feat!: solver dispatch for analytic pairs and exact discrete support (#137) (@seabbs-bot)
• feat: add the Ratio type and ratio verb (Z = X / Y) (#140) (@seabbs-bot)
• fix: exact fold for two-component mixed discrete/continuous combinations (#142) (@seabbs-bot)
• chore: bump version to 0.4.0 (#143) (@seabbs-bot)

Closed issues:

• Apply my readme style changes across our managed ecosystem (#69)
• Host the analytic-pair registry + direct CDF-kernel solver (foundation for Censored#891) (#77)
• Convolved hardcodes Continuous value support — discrete⊛discrete is mis-typed and blocks direct convolve_series (#85)
• Exact discrete branch in the combination algebra (#89)
• Probability generating function interface, iteration and fixed points (#90)
• Remove the continuous-only error gate on convolve_series (#95)
• _quantile_optimization is duplicated with CensoredDistributions — pick a shared home (#112)
• docs/src/overall_trend.png is a build artefact but not gitignored (#114)
• Add a ratio verb for Z = X / Y (#118)
• TagBot: Manual intervention needed for releases (#124)
• Support a vector of distributions for convolve_series (#126)
• Product and ratio introduced with fluff text as if different from other operators (#141)