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Figure 3 | Respiratory Research

Figure 3

From: Exhaled volatile organic compounds for phenotyping chronic obstructive pulmonary disease: a cross-sectional study

Figure 3

Scatterplots of the principal components derived from the models predicting (blue triangles): a. sputum eosinophils ≥ 1%; b. sputum eosinophils ≥ 2%; c. ≥ 2 exacerbations per year. Figure 3b for example shows that plotting factor scores 1 versus 2 from the model generated to discriminate based on sputum eosinophils ≥ 2% enables clear separation of the groups, with only two of the eosinophilics, and none of the non-eosinophilics, being misclassified.

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