Is this number causal or correlational?
Attribution assigns credit for conversions that already happened. Causal measurement estimates what would have happened otherwise. Both are legitimate; only one of them tells you what to do with next quarter’s budget. A vendor that uses the words interchangeably has not thought about the difference.
- A strong answer
- The vendor draws the distinction unprompted, names which of the two their product does, and can explain what their number would look like if the channel were switched off entirely.
- A weak answer
- "Our attribution is causal." Attribution and causal inference are different classes of method. A product can do both, but not with the same computation.