Variables

2000

2004

2006

2009

2011

2015

Coef.

S.E.

Coef.

S.E.

Coef.

S.E.

Coef.

S.E.

Coef.

S.E.

Coef.

S.E.

Education and Experience

Education

0.029

***

0.005

0.022

***

0.006

0.04

***

0.006

0.038

***

0.005

0.034

***

0.005

0.024

***

0.006

Experience

0.056

***

0.005

0.029

***

0.006

0.023

***

0.005

0.037

***

0.005

0.017

***

0.004

0.017

***

0.005

Experience, square

−0.001

***

0.000

0.000

***

0.000

0.000

***

0.000

−0.001

***

0.000

0.000

***

0.000

0.000

***

0.000

Health Status

Excellent/Good

0.324

***

0.096

0.134

*

0.077

0.306

***

0.075

-

-

-

-

0.492

***

0.094

Fair

0.185

*

0.098

0.018

0.079

0.238

***

0.078

-

-

-

-

0.373

***

0.095

Missing

0.366

***

0.123

−0.001

0.21

0.01

0.18

-

-

-

-

0.077

0.175

Type

Free

Yes

0.355

0.286

0.378

***

0.121

0.888

***

0.121

−0.088

0.236

0.386

***

0.135

−0.401

0.307

Missing

-

-

-

-

-

-

-

-

-

-

-

-

Compensation

Yes

0.373

0.284

0.409

***

0.117

-

-

-

-

-

-

-

-

Missing

-

-

-

-

-

-

-

-

-

-

-

-

Cooperation

Yes

0.352

0.287

0.111

0.131

0.559

***

0.126

−0.420

*

0.237

0.034

0.138

−0.762

***

0.314

Missing

−0.241

*

0.132

0.26

**

0.128

−0.048

0.161

0.063

0.125

−0.475

**

0.224

0.003

0.361

Other

Yes

0.364

0.286

0.282

**

0.127

0.833

***

0.131

−0.223

0.24

0.296

***

0.142

−0.470

0.313

Missing

0.365

0.311

0.263

0.192

0.519

***

0.174

−0.529

**

0.26

−1.349

***

0.466

Jobs

Technicians

0.122

***

0.054

0.186

***

0.050

0.215

***

0.052

0.285

***

0.046

0.309

***

0.036

0.264

***

0.041

Manager

0.162

***

0.057

0.094

***

0.06

0.264

***

0.062

0.317

***

0.068

0.344

***

0.045

0.236

***

0.057

Officers

0.075

0.063

0.14

***

0.054

0.087

*

0.053

0.158

***

0.059

0.157

***

0.04

0.165

***

0.043

Farmer

−0.744

***

0.040

−0.879

***

0.046

−0.599

***

0.047

−0.46

***

0.045

−0.399

***

0.042

−0.407

***

0.056

Worker

0.089

**

0.040

−0.064

0.046

0.131

***

0.044

0.088

**

0.043

0.148

***

0.032

0.142

***

0.041

Missing

−0.645

***

0.078

−0.758

***

0.053

−0.839

***

0.058

−0.628

***

0.057

−0.548

***

0.047

−0.799

***

0.048

In Addition

Female

−0.09

***

0.028

−0.189

***

0.030

−0.219

***

0.029

−0.121

**

0.028

−0.135

***

0.024

−0.128

***

0.028

Urban

0.077

***

0.032

0.134

***

0.032

0.2

***

0.032

0.08

***

0.030

0.067

***

0.025

0.095

***

0.031

Constant

7.585

***

0.31

8.539

***

0.174

7.833

***

0.176

9.164

***

0.254

9.153

***

0.163

9.919

***

0.348

Observations

5267

5380

5076

5242

6696

5675

R

0.256

0.27

0.293

0.212

0.223

0.246

Adjusted R-square

0.256

0.27

0.293

0.212

0.223

0.246