Evaluation of the prediction performance on the genus level of the decision tree. The four plots summarise the classifications on the genus level of enterobacteria subdivided into prediction outcomes of the pathogroups 'Shigella/ E. coli' (top left), 'Yersinia' (top right), 'Klebsiella' (bottom left) and 'Salmonella' (bottom right). The headline of each plot refers to the true nature of the respective test samples and the x-axis represents the pathogroups, which are contrasted in regression model analysis. In this case the linear regression model was trained on signal intensities of probes representing the main genera of considered Enterobacteriaceae (Salmonella, Shigella/E. coli, Klebsiella or Yersinia, the x-axis). The model was trained with all hybridisation patterns. The medians with standard error of predicted DNA amounts were obtained by leaf-one-out cross-validation.