变量

Obs

Mean

Std

Min

Max

$\ln quality$

400

4.626707

0.747961

2.479282

7.322516

$\ln tf$

400

−0.355975

0.196136

−0.808932

−0.042211

$\ln pgdp$

400

9.601102

1.213065

6.864843

11.389812

$\ln tar$

400

1.393676

0.805848

−2.000769

2.919061

$\ln size$

400

−2.503758

1.183382

−5.627512

1.163903

$\ln gini$

400

3.566032

0.221619

2.785011

4.120662