Attribution Modeling: Who Gets Credit for a Conversion?

WHY IT EXISTS A user rarely sees one ad and immediately buys. They might see a social media post, get a targeted email, search for the product, and then click a final ad before converting. Attribution modeling exists to untangle this complex journey and assign value to each step, so you know where your marketing budget is actually working.

THE MENTAL MODEL Imagine a soccer team scores a goal. Who gets the credit? Just the striker who kicked the ball in (last-touch)? The midfielder who made the final pass (last non-direct touch)? Or do you give partial credit to every player who passed the ball in the sequence (linear)? Attribution modeling applies these same questions to marketing channels that contribute to a conversion.

HOW IT WORKS An attribution model is a rule or set of rules that determines how credit for sales and conversions is assigned to touchpoints in conversion paths. Common models include: First-Touch, which gives 100% credit to the first channel a user interacted with. Last-Touch, which gives 100% credit to the final touchpoint before conversion. Linear, which divides credit equally among all touchpoints. And Time-Decay, which gives more credit to touchpoints closer in time to the conversion.

WHEN TO USE IT Use attribution modeling when you have multiple marketing channels and need to understand the ROI of each one. It's essential for optimizing marketing spend, justifying budgets, and understanding the typical customer journey from initial awareness to final purchase. It helps you answer "Which channels should I invest more in?"

WHEN NOT TO USE IT Simple models are often misleading for complex, long sales cycles. Be wary of applying any model without clean data; tracking must be consistent across all touchpoints for the results to be accurate. If your customer journey is extremely simple (e.g., a single-channel strategy), complex modeling is overkill.

ONE CANONICAL EXAMPLE A user sees a Facebook ad (Touch 1), then searches on Google and clicks an organic link to your blog a week later (Touch 2). Two weeks later, they receive a promotional email and click through to purchase (Touch 3). A Last-Touch model gives 100% credit to the email. A First-Touch model gives 100% credit to the Facebook ad. A Linear model gives 33.3% credit to each of the three channels. The model you choose dramatically changes which channel you perceive as most valuable.