Table 3: Evaluation indices results of fitting of different models.

GEP ANN Arps MEP
MSE 12.7578 0.0772 30.6284 10.6650
RMS 3.5718 0.2779 5.5343 3.2657
MRPE(%) 57.8088 5.3862 70.9904 60.0262
R 0.8824 0.9993 0.8150 0.9009