Fixed effects model (1)

Random effects model

Variables

t

Coefficients

z

Coefficients

5.73

3.03

5.88*

3.25

V

−0.01

0.924

−0.03

0.974

V²

4.108301

2.88

4.015671*

2.94

K/L

0.6468213

1.08

0.6227391

1.09

(K/L)²

1.70

3.40

1.77*

3.67

−1.65

−2.84

−1.68*

−3.00

−0.001628

−5.47

−0.0017776*

−6.19

OP

0.0122987

2.95

0.0117198*

2.94

OPK/L

8.19

2.90

9.04*

3.33

−9.18

−2.28

−9.99*

−2.60

0.000239

0.35−

0.000261

−0.40

−1.05

−2.76

−9.96*

−2.75

0.6150

0.5160

R²

22

22

Groups

770

770

Number of observation

35

35

Time periods

2387.24

0.0000

LM Test

Probe > chi2

140.63

0.0000

Modified Wald Test

Probe > chi2

5.59

0.2321

Human Test

Probe > chi2

22.783

0.0003

Wooldridge Test

Probe > chi2