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. 2013 Feb 6;8(2):e56167. doi: 10.1371/journal.pone.0056167

Figure 2. Box plots and discriminant analysis plot.

Figure 2

Box plots indicating (a) the silica concentration (SC, %) in animal feeds, the microwear parameters (b) number of pits (Np), (c) length of scratches (Ls), the ISO/FDIS 25178-2 parameters: (d) closed dale area (Sda on primary surface, µm2), (e) maximum peak height (Sp on S-L surface, µm) within the feeding groups (G = grass meal, GO = grass meal with crushed oats, LO = lucerne with crushed oats, and L = lucerne), * = p≤0.05. Box plots showing the median (middle line), the interquartile range (IQR, box) and the minimum/maximum values 1.5×IQR (whiskers), extreme values are excluded. Discriminant analysis (f) using microwear (Np, Ls) and texture parameters (Sda on primary surface, Sp on S-L surface) indicating significant group differences (Table 2). The canonical discriminant function coefficients are Np score1/2 = 0.038/0.015, Ls score 1/2 = −0.128/−0.014, Sda score1/2 = −0.532/0.015, Sp score 1/2 = −0.076/−0.226.