Actuarial Python Packages

chainladder

Actuarial reserving in Python

rustystats

Fast Generalized Linear Models with a Rust backend - statsmodels compatible

modelx

Use Python like a spreadsheet!

aggregate

Tools for creating and working with aggregate probability distributions.

lossratio

Python sibling of the R lossratio package: loss-ratio analysis and projection for long-term health insurance. Stage-adaptive projection (exposure-driven before maturity, chain ladder after), with maturity point and cohort regime detection. In development.

actuarialmath

Python package to solve actuarial life-contingent risks

jact

JAX library for accelerated computation of probability and cashflow calculations in semi-markov multi-state models.

burncost

Burning cost analysis for P&C ratemaking: chain-ladder, Bornhuetter-Ferguson, trend estimation, premium on-leveling, Mack residuals. pip install burncost

haute

Open-source pricing engine

actuarcredibility

Credibility models for actuarial pricing: Bühlmann, Bühlmann-Straub, Jewell hierarchical, Hachemeister regression, classical, and Bayesian (PyMC). pip install actuarcredibility

actuarydesk

Tools for actuary to model and analyze simple products or for actuarial students to practice.

insurance-monitoring

Model drift detection for insurance pricing — exposure-weighted PSI/CSI, A/E ratios, Gini drift z-test

insurance-fairness

Proxy discrimination auditing for insurance pricing — FCA EP25/2, Consumer Duty, bias metrics

insurance-datasets

Synthetic UK motor insurance datasets with known DGP for model validation

insurance-causal

Causal inference for insurance pricing — DML, CatBoost nuisance models, confounding bias reports

actudist

Python library for P&C loss distributions: severity and frequency families, MLE fitting, layer statistics, goodness-of-fit. pip install actudist

pyesg

Economic Scenario Generator for Python

insurance-gam

Interpretable GAM models for insurance pricing — EBM tariffs, Actuarial NAM, Pairwise Interaction Networks (PIN), exact Shapley values

shap-relativities

SHAP-based rating relativities from GBM models for insurance pricing — extract GLM-style factors from CatBoost, Polars

insurance-conformal

Conformal prediction intervals for Tweedie/Poisson insurance models - distribution-free coverage guarantees

actuarial-reserving

Open-source Python library for P&C loss reserve estimation — pip install actuarial-reserving

insurance-quantile

Actuarial tail risk quantile/expectile regression for insurance pricing - TVaR, large loss loading, ILF curves, CatBoost

pyprotolinc

An Actuarial Projection Tool for Life Insurance Cash Flows.

insurance-distill

GBM-to-GLM distillation for insurance pricing - surrogate factor tables for Radar/Emblem rating engines