The neural network models were implemented with the
neural network extension of the software package MATLAB
R2008a Installation [21] for MS Windows™.
Scaling of the data was conducted by prestd function.
This function normalized the input and target data such
that their means and standard deviations become equal
to zero and one, respectively. Also, according to programming,
the data which was affected the ANN lower than
0.001 was omitted.