Fig. 6

Mass to charge bins for discrimination of sex and age. Negative ion REIMS mass spectra were acquired for faecal samples from adult and juvenile mice of both sexes, and the entire data set was analysed in terms of the ability to discriminate sex or age. The intensities of the five most informative m/z bins, derived from ‘random forest explainer’, are plotted, together with summary statistical plots (median, interquartile ranges, 5–95% whiskers, individual values) for sex (a) and age (b) discrimination. In each plot, large symbols represent the intensity values for individuals that were misclassified, and small symbols represent correctly classified samples