Quiz Entry - updated: 2026.07.14
What is the difference between deterministic ("eindeutiges") and probabilistic ("wahrscheinliches") tracking?
Deterministic tracking identifies a user explicitly (via login/account), while probabilistic tracking infers identity from signals like IP, browser data, and behaviour using probability models.
| Deterministic | Probabilistic | |
|---|---|---|
| Identification | Explicit (login, account ID) | Inferred via probability models |
| Login needed? | Yes | No |
| Signals | Account IDs linked across devices | IP, browser data, surfing behaviour |
| Accuracy | Exact | High, improved by machine learning |
Deterministic is rock-solid because the user authenticated — e.g. logging into the same account on your phone and laptop lets a company link both devices to one person ("personalized offers through account IDs").
Probabilistic never needs a login: it correlates fingerprints, IP ranges, and behaviour patterns, then uses ML to decide "these two sessions are probably the same person." It's the backbone of cookieless tracking.