# Cohort Analysis

> Plan or interpret cohort analyses for users, customers, accounts, revenue, retention, activation, or behavior. Use when Codex is asked to define cohorts, compare groups over time, identify cohort effects, or write cohort analysis memos.

- **Type:** Skill
- **Install:** `agentstack add skill-jeremylongworth-source-agentskills-cohort-analysis`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [jeremylongworth-source](https://agentstack.voostack.com/s/jeremylongworth-source)
- **Installs:** 0
- **Category:** [Developer Tools](https://agentstack.voostack.com/c/developer-tools)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [jeremylongworth-source](https://github.com/jeremylongworth-source)
- **Source:** https://github.com/jeremylongworth-source/AgentSkills/tree/main/skills/cohort-analysis

## Install

```sh
agentstack add skill-jeremylongworth-source-agentskills-cohort-analysis
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Cohort Analysis

## Core Workflow

1. Identify question, cohort key, cohort start event, measurement window,
   metric, and segment.
2. Define inclusion/exclusion rules, data grain, time buckets, and censoring.
3. Separate cohort effects from calendar effects, seasonality, product changes,
   and acquisition mix.
4. Specify table/chart shape and comparison method.
5. Note data quality caveats and confidence level.
6. Convert findings into decision options or follow-up analysis.

## Safety Rules

- Do not infer causality from cohort differences without supporting evidence.
- Do not invent cohort sizes, time windows, or source fields.
- Escalate analysis used for finance, investor reporting, compensation,
  compliance, or customer commitments.

## Deliverable Shape

For cohort analyses, provide:

- Question and cohort definition
- Metric and time window
- Inclusion/exclusion rules
- Analysis table or chart plan
- Findings or expected comparisons
- Caveats and confidence
- Decision implications
- Follow-up checks

## References

- Read `references/cohort-analysis-checklist.md` when planning or reviewing
  cohort analysis.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [jeremylongworth-source](https://github.com/jeremylongworth-source)
- **Source:** [jeremylongworth-source/AgentSkills](https://github.com/jeremylongworth-source/AgentSkills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-jeremylongworth-source-agentskills-cohort-analysis
- Seller: https://agentstack.voostack.com/s/jeremylongworth-source
- Browse the marketplace: https://agentstack.voostack.com/browse

---
Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.