Digital marketing

Attribution models in digital marketing: knowing which channel really produces

2 min lukuaika
GA4-käyttöönotto ja konversioseuranta digimarkkinointiin

Attribution is the question “who made the sale?”. The customer saw an Instagram ad, typed into Google, read a blog post, clicked an ad and bought. What closed the deal? One ad or the whole chain?

In brief

  • Last click is Google’s default — it rewards the final channel.
  • Data-driven is GA4’s default — it splits value based on the data.
  • Position-based gives value to the first and last click.
  • Realistic attribution analysis needs a long run of data.

The most common models

  • Last click: 100 % to the final touchpoint. Simple but misleading.
  • First click: 100 % to the first. Rewards demand creation.
  • Linear — splits evenly across every channel.
  • Time decay: later touchpoints get more.
  • Position-based: 40 % to the first and last, 20 % to the middle.
  • Data-driven (GA4) — the algorithm splits value based on the data.

Which is the best model?

GA4 data-driven attribution in digital marketing
Data-driven attribution is GA4’s default and usually the best model.

There is no single right one. Data-driven (GA4’s default) is usually best, if you have enough data.

But for a small business with only 50–100 conversions a month, data-driven is not statistically reliable.

Practical recommendations

  • Online store under 100 conversions a month: position-based
  • Online store over 500 conversions a month: data-driven
  • B2B with a long sales cycle — first click or position-based
  • Impulse purchases — last click

Why do the models show different numbers?

Attribution models and data-driven analysis
Attribution is the question “who made the sale?”.

The same sale value can be split across channels differently. 100 % in Google Ads, 40 % in GA4, because they use different models.

Neither is “more correct”. Use the same model consistently for every decision.

Frequently asked questions

What is GA4’s default?

Data-driven attribution. It is much better than Universal Analytics’ old last click.

Can I change the model?

You can. In GA4: Admin → Attribution settings. The change affects all historical reports.

What is attribution used for?

Splitting the budget between channels. If data-driven shows Meta gets 30 % of the value, 30 % of the budget belongs there.

External sources:

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