product-analytics（产品分析）

Product Analytics

Measure what matters and make data-driven decisions.

North Star Metric

The ONE metric that represents customer value

Examples:
  Slack: Weekly Active Users
  Airbnb: Nights Booked
  Spotify: Time Listening
  Shopify: GMV

Your North Star should: ✅ Represent customer value
  ✅ Correlate with revenue
  ✅ Be measurable frequently
  ✅ Rally the team

Key Metrics Hierarchy

North Star Metric
  ├── Input Metrics (drive North Star)
  │   ├── Acquisition
  │   ├── Activation
  │   └── Retention
  └── KPIs (business health)
      ├── Revenue
      ├── Churn
      └── LTV

Event Tracking

// Track user actions
analytics.track('Button Clicked', {
  button_name: 'signup',
  page: 'homepage',
  user_id: '123'
})

// Track page views
analytics.page('Homepage', {
  referrer: document.referrer,
  path: window.location.pathname
})

// Identify users
analytics.identify('user-123', {
  email: 'user@example.com',
  plan: 'pro',
  created_at: '2024-01-15'
})

Funnel Analysis

Sign-up Funnel:
  1. Land on homepage: 10,000 (100%)
  2. Click signup: 2,000 (20%)
  3. Fill form: 1,000 (10%)
  4. Verify email: 800 (8%)
  5. Complete onboarding: 400 (4%)

Insights:
  - Biggest drop: Homepage to signup (80% lost)
  - Fix: Clarify value prop, add social proof

Cohort Analysis

Week 1 Cohort (Jan 1-7):
  - D1: 80% active
  - D7: 40% active
  - D30: 20% active

Week 2 Cohort (Jan 8-14):
  - D1: 85% active (+5%)
  - D7: 50% active (+10%)
  - D30: 30% active (+10%)

Insight: Onboarding changes improved retention!

Retention Curves

Good Retention:
  - D1: 60-80%
  - D7: 40-60%
  - D30: 30-50%
  - Flattening curve (good!)

Bad Retention:
  - D1: 40%
  - D7: 10%
  - D30: 2%
  - Steep drop-off (bad!)

Key Metrics to Track

Acquisition

• Traffic sources (organic, paid, referral)
• Cost per click (CPC)
• Conversion rate (visitor → signup)

Activation

• Signup → first core action
• Time to value
• Onboarding completion rate

Retention

• DAU / MAU (stickiness)
• Retention rate D1, D7, D30
• Churn rate

Revenue

• MRR / ARR
• ARPU (Average Revenue Per User)
• LTV (Lifetime Value)
• LTV:CAC ratio

Referral

• Viral coefficient
• Referral signups
• NPS (Net Promoter Score)

## Tools

Event Tracking: - Mixpanel (best for products) - Amplitude (good alternative) - PostHog (open-source)

Session Recording: - FullStory - LogRocket - Hotjar

A/B Testing: - Optimizely - VWO - Google Optimize (free)

## Dashboard Design

Executive Dashboard: - North Star Metric (big number) - Revenue (MRR/ARR) - Key metric trends (graphs)

Product Dashboard: - Active users (DAU/WAU/MAU) - Feature usage - Retention cohorts - Funnels

Marketing Dashboard: - Traffic sources - Conversion rates - Cost per acquisition - ROI by channel

## Summary

Great analytics:

- ✅ One North Star Metric
- ✅ Track everything
- ✅ Regular review (weekly)
- ✅ Share insights widely
- ✅ Act on data quickly