Figure 8

Determination of coefficient (R2) values calculated for \({D}_{x}/H{U}^{*}\) prediction during the verification step of the tuned GrC-ANN models developed in this study, and those reported for model tree (MTree), gene-expression programming (GEP), evolutionary polynomial regression (EPR), support vector machine (SVM) and multivariate adaptive regression splines (MARS) by Najafzadeh et al.85.