A Hierarchical Procedure for the Synthesis of ANFIS Networks

Table 1

Comparison between HHCS and OHCS for different approximation problems.

Method	HHCS				OHCS
	Rules	MSE	Iterations	Time	Rules	MSE	Iterations	Time
𝑓1(𝑥)	21	3.06	1753	1.0	18	3.26	4187	3.51
𝑓2(𝑥)	48	1.86	2420	1.0	81	1.14	4154	2.66
𝑓3(𝑥)	41	1.07	1819	1.0	37	1.23	4183	3.27

MSE values are scaled by 10⁻².