Table 2 Estimation results for the LRF

∝₀

C

0.5607*

0.2475

0.1583*

0.0603

1.9218**

0.7578

∝_OUT

ln (OUT)

− 0.4272***

0.0733

− 0.9266***

0.1203

–

–

∝_INP

ln (INP)

− 0.1499**

0.0759

0.3064***

0.0437

–

–

∝_SUR

ln (SUR)

0.0615

0.0683

–

–

–

–

∝_DIA

ln (DIA)

–

–

–

–

− 0.2574***

0.1176

β_ROO

ln (ROO)

0.2804***

0.1069

0.9156^***

0.1418

− 1.2782**

0.1993

γ_ROO,INP

½ ln (ROO)^*ln (INP)

0.0113**

0.0043

0.0230

0.0165

–

–

γ_ROO,OUT

½ ln (ROO)^*ln (OUT)

− 0.0094

0.0125

− 0.3937***

0.0633

–

–

γ_OUT,INP

½ ln (OUT)^*ln (INP)

0.0076*

0.0030

− 0.1046***

0.0168

–

–

γ_ROO,SUR

½ ln (ROO)^*ln (SUR)

− 0.0084

0.0198

–

–

–

–

γ_SUR,INP

½ ln (SUR)^*ln (INP)

− 0.0190***

0.0060

–

–

–

–

γ_SUR,OUT

½ ln (SUR)^*ln (OUT)

0.0034

0.0126

–

–

–

–

γ_ROO,DIA

½ ln (ROO)^*ln (DIA)

–

–

–

–

− 0.3709***

0.0857

β_ROO,ROO

½ [ln (ROO)]²

0.0240

0.0297

0.2967***

0.0407

0.8270**^*

0.0713

∝_OUT,OUT

½ [ln (OUT)]²

0.0847***

0.0083

0.2753***

0.0279

–

–

∝_INP,INP

½ [ln (INP)]²

0.0488***

0.0110

0.0629***

0.0062

–

–

∝_SUR,SUR

½ [ln (SUR)]²

0.0331***

0.0117

–

–

–

–

∝_DIA,DIA

½ [ln (DIA)]²

–

–

–

–

0.1537***

0.0175

R ²

Adjusted R²

 F-statistic

 F-statistic

 F-statistic