Why we track since 2019

A signal without history is just a number. To know whether today is unusual, you need a long, consistent record of what ordinary looks like — and that record cannot be assembled after the fact. It has to be collected as it happens.

That is why EvAI has tracked sources across the whole market since 2019. Years of continuous coverage give every current reading a baseline to sit against, so we can tell the difference between a genuine shift and the routine swings that happen all the time. Depth matters as much as length: watching the full market, not a handful of favourites, keeps the comparison fair.

History is also what keeps us honest. When the system flags something as notable, that judgement is measured against years of prior behaviour rather than a recent memory. The longer the record, the harder it is for noise to masquerade as a signal.