finsilabs/attribution-modeling

Attribution Modeling

Overview

Attribution modeling determines which marketing touchpoints receive credit for a conversion, enabling informed decisions about where to allocate ad spend. Every ad platform (Meta, Google, TikTok) reports attribution using its own model — typically claiming 100% credit — which means the sum of all platform-reported revenue routinely exceeds your actual revenue.

This skill guides you through setting up first-party attribution on your platform, comparing attribution models side by side, and using dedicated attribution tools that do this automatically without building custom pipelines.

When to Use This Skill

• When marketing channels (Google Ads, Meta, email) each claim different shares of the same revenue
• When needing to make budget allocation decisions across acquisition channels
• When moving beyond last-click attribution to understand the full customer journey
• When building a marketing analytics report that compares channel performance under multiple attribution models
• When implementing first-party attribution to replace data lost from iOS tracking changes
• When affiliate, influencer, and paid search all contributed to the same order and each claims 100% credit

Core Instructions

Step 1: Determine your platform and choose the right attribution tool

| Platform | Recommended Tool | Why | |----------|-----------------|-----| | Shopify | Triple Whale or Northbeam | Both built specifically for Shopify DTC brands; pull order data via API, de-duplicate cross-platform attribution, and show first-party blended ROAS | | Shopify (budget) | Shopify Analytics built-in attribution + UTM tracking | Free; shows last-click attribution by UTM source for all orders | | WooCommerce | Metorik + GA4 attribution | Metorik adds UTM tracking to WooCommerce orders; GA4 provides data-driven attribution model | | BigCommerce | Rockerbox or Northbeam | Both support BigCommerce via API integration; provide multi-touch attribution dashboards | | All platforms (mid-market) | Rockerbox or Affluent | Platform-agnostic; pull ad spend from all channels and match to first-party order data | | Custom / Headless | Build on Segment + dbt or use Triple Whale's pixel API | Capture touchpoints with Segment, store in warehouse, model attribution in dbt |

Step 2: Set up UTM tracking correctly across all channels

Good attribution starts with consistent UTM parameters. Without them, 40–60% of traffic appears as "direct" (dark traffic).

UTM naming conventions to enforce across your team:

| Parameter | Example | Rule | |-----------|---------|-------| | utm_source | google, meta, klaviyo | Always lowercase; never Google or GOOGLE | | utm_medium | cpc, email, social | Standardized list; no custom variants | | utm_campaign | spring-sale-2026 | Consistent format across platforms |

Platform-specific setup:

• Google Ads: Enable auto-tagging (adds gclid automatically); also add UTM parameters under Campaign → Settings → Additional settings → Campaign URL options
• Meta Ads: Add UTM parameters under Ad Set → Website URL, or use Meta's URL parameters feature at the account level
• Klaviyo: Go to Account → Settings → UTM Tracking — enable automatic UTM appending for all email and SMS campaigns
• Affiliates/influencers: Generate unique UTM links per creator using a URL builder; track in a spreadsheet

Step 3: Configure attribution in your chosen tool

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Shopify

Option A: Built-in Shopify Analytics (last-click, free)

1. Go to Analytics → Reports → Sessions over time
2. Filter by Referral source to see which UTM sources drove sessions
3. Go to Analytics → Reports → Sales by traffic source for revenue by channel (last-click attribution)
4. Limitation: Shopify's built-in attribution is last-click only with a 30-day window; it cannot show multi-touch paths

Option B: Triple Whale (recommended for DTC brands spending $50K+/mo on ads)

1. Install Triple Whale from the Shopify App Store
2. Triple Whale's pixel fires on every page load, capturing the full click path before purchase
3. Go to Triple Whale → Attribution to see revenue under four models side by side: first-click, last-click, linear, and Triple Whale's own blended model
4. Connect your ad accounts (Meta, Google, TikTok) under Integrations — Triple Whale then compares your platform-reported ROAS against first-party-attributed ROAS
5. Use the Summary Dashboard for a daily view of true ROAS by channel

Option C: Polar Analytics (mid-market, more affordable)

1. Install Polar Analytics from the Shopify App Store
2. Connect ad accounts under Integrations
3. Polar provides first-party attribution with multiple models and a "blended ROAS" metric that accounts for all channels

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WooCommerce

Using Metorik + GA4

1. Install Metorik (metorik.com) and connect to your WooCommerce store
2. Metorik captures UTM parameters on every order automatically — no additional plugin needed once configured
3. In Metorik, go to Reports → UTM to see orders and revenue by utm_source, utm_medium, and utm_campaign (last-click)
4. For multi-touch attribution, pair Metorik with Google Analytics 4:
   • Install GA4 via Site Kit by Google or MonsterInsights plugin
   • In GA4, go to Advertising → Attribution to configure the attribution model (last click, first click, linear, data-driven)
   • GA4's data-driven attribution requires 400+ conversions per month to activate

Alternative: WooCommerce Google Analytics plugin (free)

• Tracks ecommerce events automatically; provides last-click channel attribution in GA4

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BigCommerce

1. In BigCommerce, go to Storefront → Script Manager and add your attribution tool's pixel
2. Rockerbox (recommended): Installs via script; pulls BigCommerce orders via API to match to ad touchpoints; provides first-party attribution dashboard
3. Built-in BigCommerce analytics (Analytics → Marketing) shows traffic sources by last-click session; limited to top-level source/medium
4. For deeper analysis, connect BigCommerce to Google Analytics 4 via the official BigCommerce GA4 integration in Apps → Google

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Custom / Headless

For headless storefronts, capture touchpoints server-side and store them with orders. Then model attribution in a data warehouse:

Step 1 — Capture UTM touchpoints on every visit:

// Client-side: capture and store UTM params in localStorage on every page load
function captureUTMTouchpoint() {
  const params = new URLSearchParams(window.location.search);
  if (!params.get('utm_source') && !params.get('gclid') && !params.get('fbclid')) return;

  const touchpoints = JSON.parse(localStorage.getItem('utm_touchpoints') || '[]');
  touchpoints.push({
    source: params.get('utm_source') ?? inferSource(document.referrer),
    medium: params.get('utm_medium') ?? 'organic',
    campaign: params.get('utm_campaign') ?? '(none)',
    touchedAt: new Date().toISOString(),
    landingPage: window.location.pathname,
  });
  // Keep last 10 touchpoints (30-day look-back)
  localStorage.setItem('utm_touchpoints', JSON.stringify(touchpoints.slice(-10)));
}

Step 2 — Attach touchpoints to the order at checkout:

// Send stored touchpoints with the order creation request
const touchpoints = JSON.parse(localStorage.getItem('utm_touchpoints') || '[]');
await createOrder({ ...orderData, marketingTouchpoints: touchpoints });

Step 3 — Store and model attribution in your data warehouse:

Export to BigQuery or Snowflake via Fivetran or Stitch, then build attribution models in dbt. Use a dbt package like dbt-attribution or write your own last-click, linear, and time-decay models against your orders + touchpoints tables.

Step 4: Compare attribution models and act on the data

Run these comparisons monthly to guide budget decisions:

| What to compare | How to interpret | |-----------------|-----------------| | Platform ROAS vs. first-party ROAS | If platform ROAS is 5x but first-party is 2x, the channel is getting over-credited from view-through attribution | | Last-click vs. linear (all-touch) | Channels that appear stronger under linear are likely assisting conversions that get credited elsewhere under last-click | | First-touch vs. last-touch | First-touch shows which channels drive awareness; last-touch shows which channels close sales |

Rule of thumb: If Meta claims $200K in attributed revenue and Google claims $180K, but your total revenue was $250K, you have significant attribution overlap. Use a first-party tool (Triple Whale, Rockerbox) to de-duplicate and get a realistic picture.

Best Practices

• Always compare multiple models — no single attribution model is "correct"; the comparison reveals which channels are over/under-credited in your current setup
• Use first-party data for attribution — iOS privacy changes have made third-party pixel attribution unreliable; server-side UTM tracking is now essential
• Standardize UTM naming conventions strictly — utm_source=google and utm_source=Google are treated as different channels; enforce lowercase and a controlled vocabulary
• Apply a 30-day look-back window — most e-commerce conversions occur within 30 days of first touch; use this as your standard window
• Benchmark total attributed revenue against actual revenue — the sum of first-party attributed revenue should equal total order revenue; a large gap indicates tracking gaps
• Report blended ROAS (total revenue / total ad spend) alongside channel ROAS — blended ROAS is harder to manipulate and gives a true picture of overall marketing efficiency

Common Pitfalls

| Problem | Solution | |---------|----------| | Total platform-reported revenue exceeds actual revenue | This is expected — each platform claims 100% credit; use a first-party tool (Triple Whale, Rockerbox) to de-duplicate attribution | | 40-60% of orders show as "direct" or "none" | UTM parameters are missing from campaign links; audit your UTM setup in each ad platform; add UTMs to email footers and bio links | | UTM parameters stripped by redirect domains | Test your redirect URLs; some URL shorteners strip UTM params — use Google's URL builder and verify parameters survive | | Attribution shows email with very low credit | Email often appears late in conversion paths under last-click because customers come back via direct; check first-click model to see email's role in awareness | | iOS privacy changes reduced Meta attribution accuracy | Use Meta's Conversions API (CAPI) integration — Klaviyo and Triple Whale both support CAPI to send server-side conversion events back to Meta |

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