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Fig. 2. Berg (1992) equivalence plot for comparing 
reg to trap. Here n = 15. For reg, the mean is 27.946 ± 2.416 (P < 0.0001), the maximum value is 36.499, the minimum value is 10.602, and the median value is 31.959 (see vertical box plot). For the trap, the mean is 27.927 ± 2.423 (P < 0.0001), the maximum value is 36.504, the minimum value is 10.612, and the median value is 32.189 (see horizontal box plot). Based on the trap – reg, the mean bias is 0.0192 ± 0.0484 (P < 0.6513), the maximum value is 0.415, the minimum value is –0.300, and the median value is 0.008 (see difference box plot). The Kerrich (1966) regression slope is 1.001 with a 95% confidence interval ranging from 0.997 to 1.005 with r = 0.9998 (P < 0.0001).
