PCA scores plots of the intact 2D JRES NMR spectra of fish liver. (A) Unscaled data, (B) autoscaled data, (C) Pareto scaled data, (D) glog transformed data. The red circles represent fish sampled from the River Alde and the blue squares represent fish from the River Tyne. The black line represents the decision boundary between the classes constructed using LDA.
Parsons et al. BMC Bioinformatics 2007 8:234 doi:10.1186/1471-2105-8-234