Table 3.

Linear form of PSO models.

	qe	k	R2
PSO constants → Type I	12.3	0.0068	0.9977
PSO constants → Type II	14.2	0.0039	0.9732
PSO constants → Type III	12.76	1.0872	0.8956
PSO constants → Type IV	13.27	0.0048	0.8956