Statistical models

In many cases a process can be scientifically described by a number of formulas. However, in other cases, the exact working of the process cannot be explained in detail, since there is not enough knowledge about the process, the ingredients differ from batch to batch or the circumstances cannot exactly be controlled. In those cases a process model can be generated by statistical packages based on historical production data. The models can be used for troubleshooting and for on-line monitoring of the current batch.