变量名

样本量

均值

标准差

最小值

中位数

最大值

RD

18,454

0.0502

0.0575

0.0000

0.0380

2.9349

IE

18,454

1.4160

0.9844

0.0000

1.3128

8.3013

did

18,454

0.3498

0.4769

0.0000

0.0000

1.0000

Size

18,454

22.1590

1.2682

19.9855

21.9683

26.0936

Qr

18,454

2.1888

3.2136

0.0399

1.3606

135.6030

Lev

18,454

0.3975

0.1933

0.0571

0.3866

0.8680

Grow

18,454

0.0842

0.4892

−20.4078

0.1005

32.0421

Age

18,454

2.8361

0.3208

1.9459

2.8904

3.4657

Fix

18,454

0.2131

0.1490

0.0049

0.1847

0.6736

LnC-den

18,454

2.2412

1.5076

0.4353

1.8543

9.7383

Indep

18,454

0.3773

0.0541

0.3333

0.3636

0.5714

GDP_Z

18,454

0.0833

0.0341

−0.0534

0.0871

0.2666

Fin

18,454

0.1078

0.0501

−0.0481

0.0997

0.4044