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pm-claude-skills/plugins/pm-analytics/skills/data-analysis-standard/SKILL.md
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---
name: data-analysis-standard
description: Structures product data analysis, metric deep-dives, funnel analysis, and cohort studies. Use when asked to analyse product metrics, investigate a drop in conversion, build a dashboard spec, or explain data to stakeholders. Triggers on "analyse metrics", "funnel analysis", "cohort analysis", "data deep dive", "why did X drop".
---
# Data Analysis Standard Skill
Turn raw numbers into product decisions. Structure every analysis with a clear question, methodology, finding, and recommended action.
## Analysis Framework: The 4-Question Method
Every analysis starts here:
1. **What changed?** (describe the metric and its movement)
2. **Why did it change?** (root cause — segment, funnel step, cohort, channel)
3. **So what?** (business or product impact)
4. **Now what?** (recommended action with confidence level)
Never deliver data without answering all four. A chart with no narrative is not an analysis.
---
## Metric Triage Template
Use when a metric has moved unexpectedly:
```
METRIC: [Name]
MOVEMENT: [X% change over Y period]
BASELINE: [What was normal]
SEGMENTATION CHECK:
- By platform (iOS / Android / Web)?
- By user cohort (new / returning / power users)?
- By acquisition channel?
- By geography?
- By plan/tier?
ROOT CAUSE HYPOTHESIS:
1. [Most likely explanation] — Evidence: [data point]
2. [Alternative explanation] — Evidence: [data point]
3. [Ruling out] — Eliminated because: [reason]
CONCLUSION: [Single sentence answer to "why did this change?"]
CONFIDENCE: [High / Medium / Low] — based on [data available]
```
---
## Funnel Analysis Structure
| Stage | Metric | Current | Benchmark/Target | Drop-off % | Notes |
|---|---|---|---|---|---|
| [Top of funnel] | [Users] | [N] | [N] | — | |
| [Step 2] | [Users] | [N] | [N] | [X%] | |
| [Step 3] | [Users] | [N] | [N] | [X%] | |
| [Conversion] | [Users] | [N] | [N] | [X%] | |
**Biggest drop-off:** [Step X → Step Y] — Hypothesis: [reason]
**Recommended investigation:** [specific query or test]
---
## Cohort Analysis Guidelines
Always define:
- **Cohort definition:** [What groups users — signup week, first action, plan type]
- **Retention metric:** [What counts as retained — login, core action, revenue]
- **Retention window:** [D1, D7, D30, W4, M3, etc.]
Output a cohort retention table and annotate:
- Baseline retention for each cohort
- Cohorts that over/underperform and why (feature launch? campaign? seasonal?)
- Trend direction across cohorts (improving / declining / stable)
---
## Stakeholder Analysis Output Format
### [Analysis Title] — [Date]
**Question being answered:** [Specific question in plain English]
**Time period:** [Date range]
**Data source:** [Where data comes from]
**Finding:**
> [12 sentence plain-English summary of what the data shows]
**Key chart / table:** [Include or describe]
**Root cause:** [Best explanation with evidence]
**Confidence level:** [High / Medium / Low] — [reason]
**Recommended action:**
1. [Immediate action — owner, timeline]
2. [Investigation needed — what to check next]
3. [Monitoring — what metric to watch and at what cadence]
**What this analysis does NOT tell us:** [Important caveat — what data is missing or what can't be concluded]
---
## Guidelines
- Always state what the data *cannot* tell you — never oversell confidence
- Correlations are not causation — flag this every time
- If the user has no baseline, recommend establishing one before drawing conclusions
- Recommend the simplest chart for each finding: bar for comparison, line for trends, scatter for correlation, table for detailed breakdowns
- Always specify the time window — "conversion dropped" is meaningless without "from X to Y over Z period"