Figure 6From: HHT diagnosis by Mid-infrared spectroscopy and artificial neural network analysisInter class principle component analysis (PCA) between the HHT-negative and HHT-positive groups. The analysis was done for region 1, 3150–2750 cm-1, and region 2, 1850–750 cm-1. The projection shows that the spectra for the HHT-positive group (red crosses) and HHT-negative group (blue circles) are multimodal with overlapping modes and outliers.Back to article page