变量

(1)

(2)

(3)

Dige

0.089^**

(0.028)

0.104^**

(0.017)

0.113^**

(0.037)

Scale

−0.074^**

(0.034)

−0.036^*

(0.022)

0.138^**

(0.045)

Agg

−0.140^**

(0.068)

0.043

(0.043)

0.349^***

(0.089)

Input

−0.154^***

(0.043)

−0.018

(0.027)

0.016

(0.057)

_cons

13.03^***

(0.512)

10.93^***

(0.328)

9.919^***

(0.686)

R²

0.9732

0.9889

0.9545

Obs

99

99

99