Table 3: Statistical comparison of algorithms using nonlinear regression with AWS rain gauge observations.

Algorithm appliedNo. of data pointsCorrelation coefficientsRoot mean square error (RMSE) (mm/h)Bias (mm/h)

Nonlinear regression using SI only2516 0.654 7.542 6.653
Nonlinear regression using PCT only2516 0.673 6.763 4.563
Nonlinear regression using both SI and PCT2516 0.682 4.763 3.987