变量

观测值

平均值

标准差

最小值

最大值

epi

1072

5.796

3.405

0

11.519

talk

1072

0.129

0.335

0

1

soe

1072

0.482

0.5

0

1

size

1072

22.533

1.134

20.246

25.705

age

1072

11.32

6.254

1

24

flow

1072

0.048

0.07

−0.152

0.229

first

1072

36.582

14.925

10.007

74.18

roa

1072

0.052

0.15

−1.013

0.335

cash

1072

7.098

0.661

5.108

8.687

board

1072

2.149

0.171

1.609

2.708

leve

1072

0.496

0.209

0.056

0.952

law

1072

8.102

4.59

1.84

16.12

market

1072

7.986

1.6

4.49

9.95

city_GDP

1072

11.193

0.510

10.042

12.068