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(A, B) Boxplot of the root-mean-square error between any two of the five equations (i.e., PE, GPE, SarabiaE, SCSE, and SHE) for 60 datasets. Paired t-test was used to determine the significance of differences between any two equations at the 0.05 significance level, and different letters represent a significant difference of any two equations. The vertical solid line in each box represents the median.
