On the other hand, the use of one or more spectral pretreatments
during calibration development is a regular practice
in the development of NIR prediction models, as some of these
transformations reduce significantly the observed residuals
(NIR predicted value minus reference value). In this context, it could be interesting to know if these spectral transformations
can correct some of the observed unforeseen variations and, as
well, determine the degree and extent of the corrections.