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. 2015 Oct 9;124(5):619–626. doi: 10.1289/ehp.1509761

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Scatter plots of the observed (i.e., measured) and predicted grass pollen concentrations (grains/m³) for the larger (n = 16) (A,B) and smaller (n = 14) (C,D) data sets. In the evaluation setting, the observed concentrations were measured during morning (0800–1130 hours, 27 June–9 July 2013) (A,C) and another period (0800–1130 and 1300–1630 hours, 10–21 July 2013) (B,D). The solid line shows the optimum fit (intercept = 0, slope = 1) and the dashed line the fit to the data. Pearson’s correlation coefficients (r) are also shown.