Fig. 3. Cross-validated prediction results for the human class using the human–animal PLSDA model with six latent variables from blood samples.

Each symbol corresponds to an individual ATR FT-IR spectrum with 10 spectra per donor. Human blood spectra are shown as red diamonds and animal blood spectra are shown as green squares. The red dotted line is the threshold for classification of spectra in the human class. Only one spectrum from a human sample is misclassified.