Comparing the accuracy/precision of the new weighting factor of equation (6) (S_r–N_c) with literature published correlations of f1 and f2 (Tab. 5) for the gas phase. (a) The RMSE and (b) R ² entities were employed for determining the fit goodness of each function on six experimental datasets of Table 1. It should be noted that Dataset 1 was excluded from the analysis because it was not reported for this purpose.