chainladder

Property & casualty insurance loss reserving in Python.

IndexedMIT★ 325

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About

Property & casualty insurance loss reserving in Python. Chain ladder, Bornhuetter-Ferguson, Cape Cod, bootstrap simulation, and loss development pattern estimation. Actuarial triangle operations.

Use cases: research

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What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

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What's inside

Skill name: chainladder
Description: Property & casualty insurance loss reserving in Python. Chain ladder, Bornhuetter-Ferguson, Cape Cod, bootstrap simulation, and loss development pattern estimation. Actuarial triangle operations.
License: MIT
Instructions: 49 lines in SKILL.md · view on GitHub

Files (1)

SKILL.md

SKILL.md (first lines)

## Overview

ChainLadder implements actuarial reserve estimation methods for property & casualty insurance. Use it for loss reserving, claims triangles, and actuarial modeling in Python.

## Installation

```bash
uv pip install chainladder
```

## Basic Triangle and Reserve

```python
import chainladder as cl

# Load sample auto liability triangle
tri = cl.load_dataset("RAA")
print(tri)

# Select development pattern
dev = cl.Development().fit_transform(tri)

# Run chain ladder method
model = cl.ChainLadder().fit(dev)
print(model.reserve_)
print(model.ldf_)  # age-to-age factors
```

## Mack Bootstrap

```python
# Estimate reserve variability
mack = cl.MackChainLadder().fit(dev)
print(mack.reserve_)
print(f"CV: {mack.reserve_.std() / mack.reserve_.sum():.2%}")
print(mack.conditional_standard_error_)
```

## Bornhuetter-Ferguson

```python
bf = cl.BornhuetterFerguson().fit(dev)
print(bf.reserve_)
print(bf.expected_loss_)  # a priori expected loss
```

## References
- [ChainLadder docs](https://chainladder-python.readthedocs.io/)
- [CAS reserving principles](https://www.casact.org/)

From mkurman/zorai, MIT.

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Stars: 325
Forks: 24
Open issues: 0
Last commit (this folder): May 5, 2026 (5 months ago)
Last release: Oct 23, 2026 (4 days ago)

From GitHub (fetched Oct 24, 2026).

Details

License: MIT
Repository: github.com/mkurman/zorai
Website: zorai.app/
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: GitHub github-graphql

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Cite this page

chainladder skill. Agent Mart. https://agentmart.dev/skills/mkurman-chainladder (last updated 2026-10-24)