Application of Hybrid ARIMA and Artificial Neural Network Modelling for Electromagnetic Propagation: An Alternative to the Least Squares Method and ITU Recommendation P.1546-5 for Amazon Urbanized Cities

Table 4

RMSE values for different combinations for and .

Combination	Radial 2	Radial 3	Radial 1
	RMSE (dB)	RMSE (dB)	RMSE (dB)
Original sum combination	0.5673	1.2853	2.1471
Original product combination	652.2583	402.9861	370.2783
Original exponential combination	59.4781	48.6382	39.7458
Interpolated sum combination	3.7624	5.5556	4.4677
Interpolated product combination	273.0819	196.4770	291.8673
Interpolated exponential combination	46.5264	32.4439	49.0257