Modelling
We prepare historical data and build models for a defined question and operating range.
When it applies
We review data, separate regimes and reserve periods for validation. We document exclusions and test the model with data different from those used for fitting.
Prepared data, an evaluated model and a report of assumptions, error and range of application.
Plant trials, equipment installation and control changes require a specific scope and authorisation. This description does not replace operating procedures.
Knowledge
Modelling and control 3 min
Data describe measurements. Control requires interpreting the process state, distinguishing disturbances, choosing an action and observing its effect. A dataset may contain many rows and still fail to reconstruct…
Instrumentation and data 2 min
A historian stores values and timestamps. It does not necessarily store the operating regime, instrument condition, disturbances, manual actions or constraints that explain those values.
Modelling and control 2 min
It remains to be evaluated whether the model retains usefulness on data that did not participate in fitting and whether it represents the intended decision. A good retrospective fit may depend on future information,…
