1. A method of data processing and evaluation comprising the steps of: (a) correcting the data points of a chromatogram for baseline to provide a corrected-chromatogram; (b) smoothing the data points of the chromatogram to provide a smoothed-corrected-chromatogram; and (c) determining an entropy value for the smoothed-corrected-chromatogram based on the product of a data point value and a logarithm of the data point value for a plurality of data points of the smoothed-corrected-chromatogram.