Coefficients

Linear model

Quadratic model

Exponential model

LSRM

PSO

LSRM

PSO

LSRM

PSO

a

0.8704

0.931

0.523

0.551

2524.8

2532.4

b

2531

2652.3

−26.8491

−26.95

1.0003

1.0005

c

-

-

2780.4

2794.6

-

-