What Is an Attribution Model?
An attribution model defines rules for assigning conversion credit to marketing channels and touchpoints along the customer journey. Common models: Last Click (100% credit to the last touchpoint), First Click (100% to the first), Linear (equal credit to all), Time Decay (more credit to recent touchpoints), Position-Based (40% first, 40% last, 20% middle), and Data-Driven (AI determines credit based on actual conversion paths).
Why Attribution Matters for SEO
Under last-click attribution, SEO often gets under-credited because organic search frequently plays an awareness/research role early in the journey, while the final conversion happens through a direct visit or branded search. Proper multi-touch attribution reveals SEO's true contribution. Data-driven attribution in GA4 shows that organic search often assists 2-3x more conversions than it directly drives.
How to Choose the Right Attribution Model
Use Data-Driven attribution (GA4's default) when you have sufficient conversion data — it uses machine learning to assign accurate credit. For lower-traffic sites, use Position-Based (gives credit to both discovery and closing channels). Review GA4's Conversion Paths report to understand your customer journey. Compare models side-by-side to see how SEO's value changes. Always analyze assisted conversions alongside direct conversions to see SEO's full impact.
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