1. A method for processing a set of spectra, particularly NMR spectra, comprising the steps of: a) selecting a principal spectral range; b) recording a plurality of principal spectra in said principal spectral range; c) obtaining a reference principal spectrum in said principal spectral range; d) carrying out, for each one of said principal spectra, a bin-wise division of the principal spectrum by said reference principal spectrum to obtain a corresponding set of spectral quotients; and e) calculating, for at least one of said principal spectra, an associated set of statistical measures derived from the corresponding set of spectral quotients; characterized in that it further comprises the step of: f) carrying out, for at least one of said sets of statistical measures, an outlier detection test.