I continue with all possible combinations.
It is the same that “cross validation”, but in this case I use the LOCAL algorithm. The resulting statistics (RSQ , SEP, ….), help me to understand if the calibration will perform as it should in routine and to fine outliers.
It was very useful to improve the performance of a calibration for Process Analysis, where GLOBAL, did not perform well, and LOCAL seems to be better.
In Process we can´t expect very nice statistics, but not so high RSQ can help you to see tendencies, and take decisions immediately.