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.
Install
$ agentstack add skill-jeremylongworth-source-agentskills-cohort-analysis ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-jeremylongworth-source-agentskills-cohort-analysis) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Cohort Analysis
Core Workflow
- Identify question, cohort key, cohort start event, measurement window,
metric, and segment.
- Define inclusion/exclusion rules, data grain, time buckets, and censoring.
- Separate cohort effects from calendar effects, seasonality, product changes,
and acquisition mix.
- Specify table/chart shape and comparison method.
- Note data quality caveats and confidence level.
- 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.mdwhen 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
- Source: jeremylongworth-source/AgentSkills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.