Multi-Touch Attribution: Crediting the Full Customer Journey

Why Single-Touch Attribution Fails

A typical B2B customer journey might include: a display ad impression, an organic blog post visit, a Google search resulting in a paid click, a retargeting ad, an email click, and finally a branded Google search converting. Last-click attribution gives 100% of credit to branded search. First-click gives 100% to display. Both are wrong — and both produce systematically bad budget allocation decisions if acted upon.

Multi-touch attribution distributes credit across all touchpoints that played a role in the journey, producing a more accurate picture of which marketing investments are genuinely contributing.

Rule-Based Multi-Touch Models

• Linear: Equal credit to all touchpoints (6 touches = 1/6 each). Simple, but doesn't differentiate touchpoint value.
• Time-decay: Exponentially more credit to touchpoints closer to conversion. Reasonable for short-consideration products, but undervalues awareness.
• Position-based / U-shaped: 40% first touch, 40% last touch, 20% shared equally across middle touches. Balances initiation and conversion credit.
• W-shaped: Also credits the lead creation touchpoint: 30% first, 30% lead creation, 30% last, 10% shared middle. Useful for B2B with distinct lead creation events.

Data-Driven Multi-Touch Attribution

GA4's data-driven attribution uses ML to assign credit based on which touchpoints actually improve conversion probability in your data. It compares converting and non-converting paths to identify which touchpoints correlate with conversion. This is more accurate than rule-based models when you have sufficient conversion volume (300+ conversions per month).

Building Custom Attribution in BigQuery

For teams that need attribution logic beyond what GA4 offers — accounting for offline touchpoints, custom attribution windows, or CRM-sourced revenue — build a custom attribution model in BigQuery. Our marketing analytics consulting service designs custom attribution models matched to your specific customer journey and business model. Contact us to build a multi-touch attribution model for your marketing team.