Evaluation of the orthogonal projection approach (OPA) and the SIMPLISMA approach on the Windig standard spectral data sets

The orthogonal projection approach (OPA) and the Simple-to-use interactive self-modelling mixture analysis approach (SIMPLISMA) are two interactive self-modelling curve resolution methods which differ slightly in the criterion used for the selection of the right number of components present in the mixture data set and which differ also in the calculation of the individual concentration profiles and the pure component spectra. The advantages and limitations of the two methods were compared on four different standard spectral data sets.