变量

(1)

(2)

北方

南方

PM

1.055^***

0.510^**

(0.321)

(0.219)

SI

0.193^**

0.0292

(0.0968)

(0.0588)

TQ

−0.00193

0.000953

(0.0265)

(0.0151)

AG

0.0310

0.0874^*

(0.0449)

(0.0461)

ST

−0.151

−0.0835

(0.162)

(0.179)

GR

0.369

−0.972^*

(0.596)

(0.564)

LEV

−0.00000785

−0.638^**

(0.434)

(0.273)

ROA

0.104

0.00771

(0.0790)

(0.0499)

GDP

0.633

−0.249

(0.753)

(0.502)

TOP1

−14.71^**

7.162

(6.939)

(6.072)

DU

−0.151

−0.0835

(0.162)

(0.179)

PI

0.369

−0.972^*

(0.596)

(0.564)

_cons

−0.00000785

−0.638^**

(0.434)

(0.273)

Y

控制

控制

IN

控制

控制

r2_a

0.073

0.036

N

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