DOE evaluation with random factors ends up with unrealistc results. Why and how this can be avoided?
Hallo,we have run a DOE and monitored some DOE factors (Ta_mes, c_mes) and some additional values that supposed to be stable but have not been so (Tb_mes, random test vehicle). Modelling gives quite different predictions in case random factors are used for the model or not. They are even unrealistic (negative thicknesses s-2, or very high TE (higher than during the trials)).see for example the Pro...