Variables

OLS

(p-value)

Fixed effect

(p-value)

Random effect

(p-value)

Constant

3.187***

(0.000)

2.974***

(0.000)

3.411***

(0.000)

SSPA

0.002***

(0.027)

0.001***

(0.000)

3.111***

(0.000)

COMP

0.020**

(0.094)

0.018**

(0.093)

0.015**

(0.037)

HAP

0.059***

(0.024)

0.063***

(0.011)

0.055***

(0.003)

FGFA

0.002**

(0.054)

0.011**

(0.005)

0.012**

(0.011)

INVCO

0.047**

(0.044)

0.035**

(0.012)

0.022**

(0.015)

COMEX

0.044**

(0.014)

0.017**

(0.018)

0.055**

(0.018)

COMAT

0.066**

(0.015)

0.019**

(0.036)

0.015**

(0.022)

R² total

0.008

0.009

R² within

0.079

0.064

R² between

0.005

0.032

F tests

(p-value)

F (10, 440) = 11.66

(0.0000)

F (10, 411) = 3.54

(0.0002)

Hausman test

(p-value)

Chi² (7) = 3.89

(0.792)

Breush-Pagan

Chibar 2 (01) = 1153.12

(0.0000)

Durbin-Watson = 1.232

Number of observations

855

855