RELATED VERSIONS OF THE MULTIPLICATIVE SCATTER CORRECTION METHOD FOR PREPROCESSING SPECTROSCOPIC DATA

Various multiplicative transformations of spectral variables have been used with some success as preprocessing methods for diffuse near-infr ared spectroscopy data. We discuss first which additive/multiplicative transformations conserve the area under the spectral curve. Next we l ook at the relationship between the Multiplicative Scatter and the Sta ndard Normal Variate transformations, and use a minimizing norm formul ation to isolate three specific transformations that seem to be single d out as particularly interesting. In an empirical investigation using 8 different data sets, each with several constituents, the different transformation methods are compared.